![]() After giving our file a name and clicking the save button seen in the above image notice that the first icon within the model builder now has the name of our file. By default COMSOL will save all COMSOL files in a folder it creates called COMSOL42 however this folder name will change with the version of COMSOL being used. This file will be named “Heat Transfer Example”. This is done by clicking “File” at the top left of the screen and then selecting “Save As” as is the case with most programs. Before we continue with the Model Builder let us take a second to save our model. This is just to the left of where the Model Wizard had been. Model Builder and Saving Now that we are finished with the Model Wizard we will turn our attention to the Model Builder portion of the program. Click the finish flag at the top right of the Model Wizard to finish startup. As with the physics add the stationary study by left clicking on “Stationary” below the preset studies icon. In our case stationary will be sufficient to find the steady state solution to this problem. The final step in the Model Wizard is to select the type of study you would like to perform on our model. Multiple physics can be added to a single model by left clicking the physics to add and then left clicking the blue + sign at the bottom left of the Model Wizard menu screen. Click the triangle to the left of the Heat Transfer module to see the drop down menu which contains Heat Transfer in Solids, left click this so that it is highlighted then click the blue, right pointing arrow at the top right of the Model Wizard menu screen. This can be found under the Heat Transfer module. In this case heat transfer in solids will be selected. Next select the applicable physics for the model. For this problem start by selecting 2D, continue by clicking the blue, right pointing arrow at the top right of the Model Wizard screen. This wizard asks you to define the spatial dimension you’ll be using for the model as well as the applicable physics and the type of study you wish to perform (either time dependant or stationary). ![]() When COMSOL starts, the Model Wizard will be open automatically. Start COMSOL by clicking the COMSOL Multiphysics 4.2 icon. ![]() Given that heat diffusion should be the same at any given θ it is reasonable to define this problem in 2D as follows. The fluid temperature is constant at 300K and this is the temperature of the surrounding sheath at R2. The temperature at R1 is the same as the temperature of the heater, 400K. After thinking about the problem, assume that we arrived at the following approximations (make sure you understand how we arrived at following approximations for your future quiz and test): The temperature of the heater is constant at 400K. We wish to determine the temperature distribution within the sheath. The entire assembly is immersed in a fluid and the system is at steady-state, as shown below. (Heat transfer) Consider a cylindrical heating rod which is sheathed by a concentric tube of thickness 0.05 m and which starts 0.05 m away from the center. The order is also variable depending on the complexity of the model. Not all of these steps are always necessary when building a model. Display the desired results in the most meaningful way (Results). Adjust solver parameters and compute (Study). Choose the element size to be used (Mesh). you will need to enter these for Laminar Flow and again for Heat Transfer if you are using both ). ![]() Select the boundary, bulk and initial conditions for your system for each physics you are using (This will be entered separately for each different physics you are using e.g. Select the materials you wish to use in your model (Materials). Define the geometry of the model (Geometry). Define the parameters, equations and variables pertinent to the model (sub directory (Global Definitions). Work through the COMSOL Model Wizard which will require you to select the coordinate system for the model, the relevant physics to the problem, and the type of study you wish to perform (Time dependant or stationary). The packages are cross-platform (Windows, Mac, Linux,Unix.) In addition to conventional physics-based user-interfaces, COMSOL Multiphysics also allows for entering coupled systems of partial differential equations (PDEs). COMSOL Multiphysics also offers an extensive interface to MATLAB and its toolboxes for a large variety of programming, preprocessing and postprocessing possibilities. COMSOL 4.2 Tutorial COMSOL Multiphysics (formerly FEMLAB) is a finite element analysis, solver and Simulation software / FEA engineering applications, Software package especially coupled for various physics and phenomena, or multiphysics. ![]()
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