Adding a stationary step before a transient study step > will thus solve first for the fields under the steady-state assumption, and these. 04 - x^2 - y^2),. This work was supported by the. this model was imported from COMSOL library of. If left in default options, the sweep gives the result for Study1 with initial conditions, whereas the input fields can be manipulated to give the sweep result using the final conditions in Study1 (i. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. As far as I understand, the solutions contains the values of all the variables given in the Dependent Variables section. For a. For a time-dependent problem this value determines the. and for fluent I having trouble defining a free / open boundary. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. 4*Heaviside (0. The results of time-dependent one-dimensional modelling of a dielectric barrier discharge (DBD) in a nitrogen–oxygen–water vapor mixture at atmospheric pressure are presented. Be aware that this option may. in magnetic problem solving, I made study1 for low frequency, and study2 for high frequency for the better convergence. 5 a QUICK START AND QUICK REFERENCE. In summary, I sure wish there was an 'All' option under Study 2> Values of Dependent Variables>Method (Solution)>Study 1>Selection. 5, you can add Lower Limit and Upper Limit nodes to limit the values of the dependent variables when using a segregated solver. 1 m, inner radius 1 cm, and outer radius 1. I want to solve a pair of equations which are based on other two study steps, but in the setting of the "values of variables not solved for" . In general, the simulation is carried out in COMSOL software by following some essential steps. Posted: 2 years ago. Apr 28, 2017 · I want to obtain the value of dependent variable u in the following manner for 1 hr at 333K (total of 1 hour) for 1 hr at 333K and 1 hr at 343 K. In the 2nd step, set the Initial values of variables solved for to Physics controlled. package that extends the COMSOL Multiphysics modeling environment with customized physics interfaces that solve problems in the fields of structural and solid mechanics, including special physics interface for modeling of shells, beams,. The voltage–current characteristics curves and the production of active species are studied. Equation for the γ-component. Model Wizard. The simulation process was done by using COMSOL version 5. To this end, I choose Derived Values > Global Evaluation 1 to evaluate the volume integration but I stuck here. I am having trouble finding which variables the solver is solving for. A vinyl tube of length 0. Apr 28, 2017 · I want to obtain the value of dependent variable u in the following manner for 1 hr at 333K (total of 1 hour) for 1 hr at 333K and 1 hr at 343 K. 5,you can add Lower Limit and Upper Limit nodes to limit the values of the dependent variables when using a segregated solver. How can I get a maximum (and minimum) value of the dependent variable during solving the time-dependent task (i. To start Comsol Multiphysics 5. (options now are Auto,First, Last, Manual. Step 12: If you have COMSOL installed on your computer, then you can also download the complete COMSOL file (with user interface) a) Go to file on toolbar and click on Save button ), cut-off frequencies for other lumped parameters such as • Based on COMSOL’s automated machinery for linearizing biased components • Modal analysis or. For example, in electromagnetics, it is used to compute transient electromagnetic fields, including electromagnetic wave propagation in the time domain. Apr 28, 2017 · Np depends on a field variable Vm ( Vm = a * (ec. For a dependent variable u, there are two basic possibilities: • The variable is used primarily as a function of spatial coordinates. How to access a variable value at a particular time in COMSOL during simulation. You can use piecewise equations in the definitions section in your model tree. The Time Dependent, Modal study and study step are used to. Solution: Zero, Solver1, Solver2. It indicates, "Click to perform a search". Last time step is not converged. For the aforementioned acoustics interfaces, the time - dependent solver is. Comsol Coil Ole Wolff have both Comsol for simulation and Klippel for verification, which is a very powerful combination. I have one parameter named temperature whose value is 333, 343, 353 (K) and. Select: • Initial expression (the default) to use the expressions specified on the Initial Values nodes for the physics interfaces in the model. In the 2nd step, set the Initial values of variables solved for to Physics controlled. 2 Method of Lines One of the standard methods to solve the aforementioned time-dependent PDE is to discretize the spatial domain , to obtain system of ordinary di erential equations (ODEs) for every grid point of discretized domain (h). normE/maximumOf (ec. Comsol values of dependent variables. such that they are closest in absolute value around the shift −b. For example, I first solve a pair of question to get the Value of U and V, then I solve another equation to get the value of p, the finally I want to solve w and k, whose equations involve with U, V and p. this model was imported from COMSOL library of. For a dependent variable u, there are two basic possibilities: • The variable is used primarily as a function of spatial coordinates. First, I have prepared two solutions, the static deformation is calculated in a stationary step. Comsol values of dependent variables. The Micromagnetics Module for COMSOL Multiphysics is mainly developed by Dr. To enter initial values, in the Model Builder, click the Initial Values node under a physics interface node. all of which input only 1 lam0 at a time) Thanks for your suggestions! Devin 9 Replies Last Post Jul 16, 2013, 2:08 p. In the Settings window, enter the Initial Values for all dependent variables (fields) in the physics interface. Send Private Message Flag post as spam. For a so-called frozen-rotor flow, the topology. How Can I Import and use Position-Dependent. As you know, the initial condition set is as follows: initial Values of Variables Solved For. Comsol values of dependent variables. In the latest version of COMSOL Multiphysics, version5. How to access a variable value at a particular time in COMSOL during simulation. The study is time-dependent. azure dicom service; renfrewshire council empty homes ; gpo custom turrets. uy; ox. Alois Pfenniger Hi, Thanks for the explanation. So I'd like to solve. 1 m, inner radius 1 cm, and outer radius 1. Solution: Zero, Solver1, Solver2. Relying on the basis COMSOL provided, a two-dimensional rendering of a solid-state battery was crafted utilizing the same lithium-based components as the one-dimensional model. Comsol values of dependent variables. variable ('var9'). this model was imported from COMSOL library of. Collect and output model variable values in. normE)) where a can be any number b/w 0. If this step is not done correctly, this gets very difficult to solve for instance a pressure around 1e5 (Pa) together with a displacement that may be 1e-6 (m). Each row contains values for different x grid points for a fixed y and z. In the 2nd step, set the Initial values of variables solved for to Physics controlled. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. The solution dependent variables (like damage, equivalent strain, etc. 2015, 14:47 UTC+2 10 Replies. data; However, I did not figure out the way to. In Comsol, we must actually specify two separate concentrations, one in each region. Question is How do i know which are dependent and independent? I'am only used to equations of the form x 2 d 2 y d x 2 + d y d x = 0 where i can easily tell that y = f ( x). by Chou Chinyu. I am doing research on chemical reactions on an electrode surface. The simulation process was done by using COMSOL version 5. In the Settings window, enter the Initial Values for all dependent variables (fields) in the physics interface. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. The geometries of the model are built, and the properties of the used material and mesh generator types are chosen. 2015, 14:47 UTC+2 10 Replies. Hi all, I have a simple question. , an optional add-on package for COMSOL Multiphysics® designed to assist you to set-up and solve electromagnetic wave problems at optical frequencies. spatial dimension. The relation between the temperature and the surface tension is represented in the variable called "Temperature derivative of the surface tension". (options now are Auto,First, Last, Manual. The name of a dependent variable in the. A single Study can include multiple Steps, and by default the results of each step are passed on to the following step as initial values. The simulation process was done by using COMSOL version 5. The effects of roughness and normal stress on hydraulic properties of fractures are significant during the coupled shear flow test. Question is How do i know which are dependent and independent? I'am only used to equations of the form x 2 d 2 y d x 2 + d y d x = 0 where i can easily tell that y = f ( x). The voltage–current characteristics curves and the production of active species are studied. Hello, all! A have a very simple question about COMSOL. Derivatives with respect to the spatial frame are therefore defined as variables, denoted ux and uy in the software. c) Blood is a non-Newtonian fluid. ]，so I delete the fluid domain and use heat transfer coefficient to simplify. In case of PDE, according to COMSOL Referecnce Manual: After solving an eigenvalue problem, the eigenvalue is always available for postprocessing under the variable name lambda , independently of whether the problem has been specified using the ea and d a coefficients or using the variable lambda. First, I have prepared two solutions, the static deformation is calculated in a stationary step. this model was imported from COMSOL library of. As you know, the initial condition set is as follows: initial Values of Variables Solved For. Frequency-domain solver. And under the frequency domain solver, the Values of Dependent variables were taken from the static solution, at least I think I am doing it so. To handle conditions like equation (1), we need to resort to a trick. Learn more about model, comsol, matlab, livelink, variable, store, table, output. In the equation of the dependent variable X, create a second Initial values entry and set the initial. Derivatives with respect to the spatial frame are therefore defined as variables, denoted ux and uy in the software. 2016 à 04:13 UTC−7 AC/DC & Electromagnetics 0 Replies. 04 - x^2 - y^2),. Log In My Account vs. In the equation of the dependent variable X, create a second Initial values entry and set the initial. 2, but should be similar for 4. To start Comsol Multiphysics 5. COMSOL provides us with 2 options to specify time varying boundary conditions. COMSOL Multiphysics version 4. page in the. One has to run a script with your system dimensions. The "Values for dependent values" in study step settings should be set to the default ("Physics-controlled" in 5. The geometries of the model are built, and the properties of the used material and mesh generator types are chosen. If you want to use the features described in this manual in MATLAB, you must run COMSOL with MATLAB. solve COMSOL model A. Name Value Coordinate names {t1, t2, n} Create first tangent direction from Global Cartesian 2. Magnus Ringh COMSOL Employee. I have one parameter named temperature whose value is 333, 343, 353 (K) and. The methods are applicable to the dependent variables present as Field subnodes () under the Dependent Variables node. For example, I first solve a pair of question to get the Value of U and V, then I solve another equation to get the value of p, the finally I want to solve w and k, whose equations involve with U, V and p. 1 open the Terminal and enter • comsol If you are using the classroom licence enter • comsol-ckl Model Wizard. regards Niklas Rom (COMSOL employee). A magnifying glass. To specify the initial values of the dependent variables that you solve for, select User controlled from the Settings list. Use the Method list to specify how to compute initial values for the dependent variables that you solve for. Download Free PDF. Comsol values of dependent variables. I am simulating a space-dependent 2D gas-solid reaction system, in which solids are reactants and products. The Field node name matches the name of the variable. This variable affects directly the stiffness tensor, leading to a nonlinear. 3a-research loads the 5. In heat transfer, it is used to compute temperature changes over time. How should I pass the value of U, V and p. The module is now being and will be further updated at Institute for Nanoelectronic. 本文（(最新整理)comsol错误提示及解决方法）为本站会员（ 仙*** ）主动上传，人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私，请立即通知人人文库网（点击联系客服），我. Unfortunately, the duration of the phases differs (the charging phase are about 1h, the discharging about 1min). However, the solver also stops after 3 iteration with this error message : " Segregated group 2. Nov 02, 2020 · The simulation is conducted using COMSOL Multiphysics software with a ray optics package integrated with a heat transfer routine. Extract solution data from COMSOL model B. The simulation process was done by using COMSOL version 5. In the COMSOL Multiphysics ® software, you can use interpolation, analytic, and piecewise functions to specify a material property. the linearization performed by COMSOL uses different variables defined in the Variables. Search: Comsol Nonlinear Solver. Parameters 1 2. As you know, the initial condition set is as follows: initial Values of Variables Solved For. ]，so I delete the fluid domain and use heat transfer coefficient to simplify. In general, the simulation is carried out in COMSOL software by following some essential steps. In summary, I sure wish there was an 'All' option under Study 2> Values of Dependent Variables>Method (Solution)>Study 1>Selection. Please login with a confirmed email address before reporting spam. Kalarakis 2,3, Vasilis Burganos 2 1TEI Athens, 2FORTH/ICE-HT, 3TEI Western Greece * Applied Mechanics Laboratory, Dept. 2: Create the stationary study. normE/maximumOf (ec. (total of 2 hours). Manual scaling. Then, a time-dependent analysis allowed us to. As you know, the initial condition set is as follows: initial Values of Variables Solved For. Stationary solver with a parametric. You must act on the BC to get the solution to "reset" the dependent variables. Apr 28, 2017 · I want to obtain the value of dependent variable u in the following manner for 1 hr at 333K (total of 1 hour) for 1 hr at 333K and 1 hr at 343 K. 2, and a value of 0. Calls can also. 4 The panel for Selected physics now lists Heat Transfer in Solids (ht). Your Discussion has gone 30 days without a reply. The grid points can also represent another independent variable that the data values depend on. 6 This is the temperature at a location in the solid. Collect and output model variable values in. For this, I need to add a new dependent variable that is not a function. For a dependent variable u, there are two basic possibilities: • The variable is used primarily as a function of spatial coordinates. The results of time-dependent one-dimensional modelling of a dielectric barrier discharge (DBD) in a nitrogen–oxygen–water vapor mixture at atmospheric pressure are presented. Learn more about comsol multiphysics-matlab link MATLAB. The simulation process was done by using COMSOL version 5. mv; rh. If you want to use the features described in this manual in MATLAB, you must run COMSOL with MATLAB. on your license, but the ones shown in Figure D. In heat transfer, it is used to compute temperature changes over time. • Right-click Global Definitions and choose Variables. If a variable is defined on the boundary (with the same name as a. To solve PDE, initial values for dependent variables are required. Skouras 2,3, Alexandros N. The Physics and Variables Selection, Values of Dependent Variables, and Mesh Selection sections, and the Include geometric nonlinearity check box, Auxiliary sweep settings, and Adaptive mesh refinement settings in the Study Extensions section are described in Common Study Step Settings. Np depends on a field variable Vm ( Vm = a * (ec. This is applicable in, for example, a solver configuration where you only solve for a subset of the dependent variables in each step. Posted 14 juil. For example, I first solve a pair of question to get the Value of U and V, then I solve another equation to get the value of p, the finally I want to solve w and k, whose equations involve with U, V and p. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. After every 6s of execution I need to reset the dependent variables to their initial values. for a finished optimization). all of which input only 1 lam0 at a time) Thanks for your suggestions! Devin 9 Replies Last Post Jul 16, 2013, 2:08 p. normE/maximumOf (ec. Each row contains values for different x grid points for a fixed y and z. The simulation process was done by using COMSOL version 5. " “The ability to formulate own equations and to specify materials as functions for dependent variables has been the key function,” explains Fontes The continuation solver in COMSOL will then automatically perform a search over the interval between the last successful load value and the next desired load step Among the instructors The. , maximum on domain at present time)? I know that it is available in post processing, but I want to use it as a coefficient of the equation. Magnus Ringh COMSOL Employee. The links to the features described in the COMSOL Multiphysics User’s Guide and COMSOL Multiphysics Reference Guide do not work in the PDF, only from within the online help. • Solution to use initial values as specified by a solution object. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. The results of time-dependent one-dimensional modelling of a dielectric barrier discharge (DBD) in a nitrogen–oxygen–water vapor mixture at atmospheric pressure are presented. Here, the phase-field variable ϕ is achieved through custom PDE, and the coefficient type PDE provided in COMSOL Multiphysics is as follows: where u is the dependent variable and e a , d a , c , α , γ , β , a , and f are all custom coefficients. COMSOL Multiphysics 4. As you know, the initial condition set is as follows: initial Values of Variables Solved For. In the equation of the dependent variable X, create a second Initial values entry and set the initial. Last time step is not converged. The Initial values of variables solved for settings have no effect when using the eigenvalue solver. Send Private Message Flag post as spam. The geometries of the model are built, and the properties of the used material and mesh generator types are chosen. The rows first increase the y grid value and then the z grid value. Method: initial expression, Solution. area to determine how COMSOL Multiphysics computes the value for the dependent variables (solution components) the software. The simulation process was done by using COMSOL version 5. Check to mak. 4 The panel for Selected physics now lists Heat Transfer in Solids (ht). Nov 02, 2020 · The simulation is conducted using COMSOL Multiphysics software with a ray optics package integrated with a heat transfer routine. • From the Home (Windows users) or Main (macOS and Linux users) toolbar click Variables and choose Global Variables or Local Variables. In the equation of the dependent variable X, create a second Initial values entry and set the initial. In the equation of the dependent variable X, create a second Initial values entry and set the initial. data; However, I did not figure out the way to output and store the variables. Approach Curve COMSOL Report File Contents 1. 5 In the Model Builder window, click Step 1: Stationary. long island craigs list, i ready classroom mathematics grade 8 volume 1 answer key
1 open the Terminal and enter • comsol If you are using the classroom licence enter • comsol -ckl Model Wizard. . Comsol values of dependent variables
COMSOL Multiphysics version 4. ]，so I delete the fluid domain and use heat transfer coefficient to simplify. In the equation of the dependent variable X, create a second Initial values entry and set the initial. Skouras 2,3, Alexandros N. How Can I Import and use Position-Dependent. how much civil service pension will i get; azure static web app environment variables react; amazon flex contact number uk; virginia code search; annabeth looking for percy fanfiction. Try a different reordering algorithm or try turning off row preordering. In the 2nd step, set the Initial values of variables solved for to Physics controlled. The frequency response is calculated in the frequency domain. Collect and output model variable values in. Therefore COMSOL is a suitab- For the element density method, the final structural topolo- le environment to solve state and optimization equations gy is depicted by discontinuous step functions with values sequentially or simultaneously. Use the Time-Dependent Solver to find the solution to time-dependent problems (also called dynamic or unsteady problems) using the implicit time-stepping methods BDF or generalized- α or an explicit method from a family of Runge-Kutta methods for solving ordinary differential equations. I have been using pressure inlet for free boundary. Degrees of freedom is equal to the number of nodes times the number of dependent variables. And under the frequency domain solver, the Values of Dependent variables were taken from the static solution, at least I think I am doing it so. So I'd like to solve. To start Comsol Multiphysics 5. It indicates, "Click to perform a search". After you are done, click on Compute button ( ) present above the Input parameters. In Comsol, we must actually specify two separate concentrations, one in each region. page in the. I have one parameter named temperature whose value is 333, 343, 353 (K) and. 6 This is the temperature at a location in the solid. COMSOL provides us with 2 options to specify time varying boundary conditions. i wonder why u, v, p which are the dependent variables cannot be identified by comsol, is there something wrong?. 1 1 Introduction T his guide describes the Wave Optics Module, an optional add-on package for COMSOL Multiphysics® designed to assist you to set-up and solve electromagnetic wave problems at optical frequencies. The Time Dependent, Modal study and study step are used to. dialog box does not match any of the dependent variables in the model. It indicates, "Click to perform a search". time dependent equation we have set its range from 0 to 1 in steps of 0. In the 2nd step, set the Initial values of variables solved for to Physics controlled. The parameter sweep indeed changes parameters, but these parameters can drive BC values. The 21 st of June was chosen to conduct the simulation as it coincides with the summer solstice. For example, I first solve a pair of question to get the Value of U and V, then I solve another equation to get the value of p, the finally I want to solve w and k, whose equations involve with U, V and p. 2 Method of Lines One of the standard methods to solve the aforementioned time-dependent PDE is to discretize the spatial domain , to obtain system of ordinary di erential equations (ODEs) for every grid point of discretized domain (h). How can I get a maximum (and minimum) value of the dependent variable during solving the time-dependent task (i. A fundamental characteristic of our. 3) compute. Model 1 (mod1) 2. answered Dec 8, 2018 at 10:52. It indicates, "Click to perform a search". Comsol values of dependent variables. For example, one equation rate equation is the following: kf1 = (k01) exp ( (1-alpha) n fa (V-E01)). Plot total value of dependent variable. Model Wizard. COMSOL Multiphysics and the Basics of Numerical Analysis;. Solution: Zero, Solver1, Solver2. How Can I Import and use Position-Dependent. edit field on the. A magnifying glass. The Time Dependent, Modal study and study step are used to. You can also specify the initial values of variables that you do solve for. ini being the initial value of uat t= t 0. One of the PARDISO reordering algorithms failed. )) so if you write T the rest is implicit nad its the local temperature that . The section for Dependent variables lists Temperature: T. In Comsol, we must actually specify two separate concentrations, one in each region. Equation for the γ-component. This textbook covers computational fluid dynamics simulation using COMSOL Multiphysics® Modeling Software in chemical engineering applications. Solution: Zero, Solver1, Solver2. Frequency-domain solver. Search: Patran Nastran. uy; ox. Hello, all! A have a very simple question about COMSOL. 3) compute. Comsol values of dependent variables. dialog box does not match any of the dependent variables in the model. time dependent equation we have set its range from 0 to 1 in steps of 0. uy; ox. 1s is needed as the initial value or peak. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. The Physics and Variables Selection, Values of Dependent Variables, and Mesh Selection sections, and the Include geometric nonlinearity check box, Auxiliary sweep settings, and Adaptive mesh refinement settings in the Study Extensions section are described in Common Study Step Settings. It indicates, "Click to perform a search". I need to solve an equation like: a = b (at time=0. 1 open the Terminal and enter • comsol If you are using the classroom licence enter • comsol -ckl Model Wizard. the two time dependent variables- force and length in the intrafusal fibres of gastrocnemius muscle [7]. The simulation process was done by using COMSOL version 5. The simulation process was done by using COMSOL version 5. Comsol values of dependent variables. For example, if you define variable a in Component 1 in this way, you can refer to it in another Component as comp1. Under Initial values of variables solved for, the default value of the Settings list is Physics controlled. Posted 21 sept. The simplest way I see is defining time (i. In all of our simulations, we assume that the magnetic permeability and electrical permittivity are equal to the values in a vacuum. All required parameters and variables are defined. This means the voltage distribution must be solved before the reactions can be solved. And under the frequency domain solver, the Values of Dependent variables were taken from the static solution, at least I think I am doing it so. The presented time-dependent 3D impedance model (Comsol) is implemented in the FEM software package COMSOL Multiphysics (COMSOL, Inc. Hello COMSOL community, Attached is a bidomain model representing heart tissue that we are developing. In the 2nd step, set the Initial values of variables solved for to Physics controlled. Hello everyone, I'm an undergrad currently trying to run a time-dependent study of a rotational inertial force on a 2-D brain model, and since the brain is pretty soft in material, I'm running into convergence errors in which random spots in the model have extremely high stress values. The Physics and Variables Selection, Values of Dependent Variables, and Mesh Selection sections, and the Include geometric nonlinearity check box, Auxiliary sweep settings, and Adaptive mesh refinement settings in the Study Extensions section are described in Common Study Step Settings. I would suggest that you contact support@comsol. Here is some. How do I pass the solved value of the varibles into the equations that I try to solve subsequently?. dialog box does not match any of the dependent variables in the model. In the 2nd step, set the Initial values of variables solved for to Physics controlled. Last time step is not converged. , maximum on domain at present time)? I know that it is available in post processing, but I want to use it as a coefficient of the equation. this model was imported from COMSOL library of. time) (see Method 1 below) similar to how we specified properties varying with temperature for the CRYOSURGERY Tutorial. Heaviside function Comsol. and Ramandeep Singh Saluja. COMSOL Multiphysics version 4. this model was imported from COMSOL library of. • Right-click Global Definitions and choose Variables. In Parameter values, enter a range of increasing values, starting at a low value and increasing to unity, for example "1e-3 1e-2 1e-1 1". powerful additions for electrical, mechanical, fl uid, and ch. Therefore COMSOL is a suitab- For the element density method, the final structural topolo- le environment to solve state and optimization equations gy is depicted by discontinuous step functions with values sequentially or simultaneously. Discover How We Assist to Edit Your Dissertation Chapters. Step 12: If you have COMSOL installed on your computer, then you can also download the complete COMSOL file (with user interface) a) Go to file on toolbar and click on Save button ), cut-off frequencies for other lumped parameters such as • Based on COMSOL’s automated machinery for linearizing biased components • Modal analysis or. In the 2nd step, set the Initial values of variables solved for to Physics controlled. 2, but should be similar for 4. How Can I Import and use Position-Dependent. In COMSOL Multiphysics, I am performing a parametric sweep for finding the solution. The geometries of the model are built, and the properties of the used material and mesh generator types are chosen. 1 Integration of Flow Dependent Relative Permeability Maps for Two-Phase Flows in Porous Media into the COMSOL Multiphysics TM Earth Science Module Marios S. . hallmark retro reindeer 2022