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The menu Multiphysics is to perform changes in the model by adding or removing. Not all of these steps are always necessary when building a model.

The order is also variable. Consider a cylindrical heating rod which is sheathed by a concentric tube of thickness 0. The entire assembly is immersed in a fluid and the system is at steady-state, as shown below. We w is h to determine the temperature d is tribution within the sheath.

After thinking about the. The fluid temperature is constant at K and th is is the temperature of the surrounding sheath. Given the symmetry of the system, it will enough for the analys is to define a subdomain in 2D.

For our case we select Steady-state analys is. Once we select the regime three new fields will be activated at the bottom of the window. The field Dependant variables is to specify a name for the dependant variable. Let us keep. Likew is e, let us change the name of the application mode PDE from ht default name to.

The third field has to do with the numerical calculations. Let us keep the same value for the. Once we have done th is we click on OK. A new window will pop up as shown. Heat transfer. After doing th is , we must click on the button Save.

The file will be saved. The next step is to specify the geometry of our system. The idea is to use as few figures as. Thus, the dimensions of. The position is. After entering the. Finally, we release the left button of the mouse and the object will look bigger as. We can also do th is by pressing the. Every region in our drawing is called a subdomain.

Since we only have one rectangle then. Next, we have to specify the material the. To do so, we. To achieve th is , we must click on the menu Physics and the option Boundary. Settings or simply press the key F7.

The following windows will be d is played. For the boundary 1 the temperature is known and equal to K. After clicking OK, we are now ready to run the model. To do so, we must click on the icon. The results are d is played as. Another possibility is to obtain a temperature profile at certain cross section. Th is can be. In the window showing up we must specify two points that define the cross section if working.

For instance, if we want a temperature profile along the section defined by the points. If the fluid used in the system is not contained in the library we can specify its properties. K and the density and the. K respectively.

Th is data is entered as shown below. How to create a new model in Comsol 1. Define the geometry menu Draw 3. Enter the variables needed and boundary conditions in each equation for every subdomain menu Physics 4. Choose the element size to be used in the calculations menu Mesh 5. Choose the type of numerical solver menu Solve 6. D is play the results in the most convenient way menu Postprocessing 7.

The menu Multiphysics is to perform changes in the model by adding or removing equations. The order is also variable depending on the complexity of the model.

After thinking about the problem, assume that we arrived at the following approximations make sure you understand how we arrived to following approximations for your future quiz and test :. After thinking about the problem, assume that we arrived at the following approximations make sure you understand how we arrived to following approximations for your future quiz and test : The temperature of the heater is constant at K.

The temperature at R1 is the same as the temperature of the heater, K. The fluid temperature is constant at K and th is is the temperature of the surrounding sheath at R2. Given the symmetry of the system, it will enough for the analys is to define a subdomain in 2D as shown below. Solution using Comsol Graphical User Interface. In the Model Navigator window we must choose the type of coordinate system that we want to use to solve our problem.

As mentioned above, our problem is pretty symmetric and therefore a 2D system which is the default value will be enough. In accordance with the statement, the problem can be solved considering only conductive heat transfer. Next, we double click on the option Heat Transfer.

In doing so two new options will show up. We must pick one of them depending on the type of regime we will use to solve our problem. For our case we select Steady-state analys is doing one click on th is option. Let us keep the default name T for the variable temperature. Likew is e, let us change the name of the application mode PDE from ht default name to Conduction. Let us keep the same value for the time being. A new window will pop up as shown below. Before going any further, let us save our work.

To do so, we click on the menu File and then on the option Save As. To save our work we must specify the path and the name of the file. Let us call our model Heat transfer. The idea is to use as few figures as possible to define our system. For our case, the symmetry of the system allows us to use one single rectangle to define our model. Thus, to draw a rectangle we click on the menu Draw, then on the option Specify objects and finally on the option Rectangle. In the new window showing up we specify the size and the position of the rectangle we are drawing.

Since we have to specify dimensions we must be careful with the values we will enter. Thus, the dimensions of our rectangle will be 0. The position is not important for th is case and therefore we will keep the default values. After entering the values we click on OK. The rectangle just drawn will be d is played as shown below To zoom in the rectangle we must click the button at the center and the top of the screen. After that, we press the left button of the mouse and drag the mouse to cover the object.

Finally, we release the left button of the mouse and the object will look bigger as shown below. Next, we must click on the menu Physics and then on the option Subdomain Settings to define the parameters needed by the PDE to be solved. We can also do th is by pressing the key F8. The following window will show up. Since we only have one rectangle then the area of th is object will be the subdomain 1. Next, we have to specify the material the concentric tube is made of in order to use their properties in the calculations.

To do so, we select the subdomain 1, click the field Loadâ€¦ and select Copper from the Library of materials. Then we click OK. The properties of copper will be loaded on the subdomain 1 as shown below. To achieve th is , we must click on the menu Physics and the option Boundary Settings or simply press the key F7. In the subdomain 1 we have 4 boundaries and we must specify each of them in order to solve the model.

The boundary currently specified will show up selected with a red arrow as shown below. To indicate th is we select the option Temperature in the field Boundary condition and enter the value in the field T 0.

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