Tutorials can be found throughout the COMSOL website, including modeling in COMSOL Multiphysics using the Model Builder. .. or Open PDF Document. Click Open Application, Run Application, or Open PDF Document. .. This tutorial demonstrates the concept of multiphysics modeling in COMSOL. We will do. The COMSOL Multiphysics Geometry and CAD Environment Overview of It serves as a tutorial and a reference guide to using. COMSOL any model of interest, and select Open Model and PDF to open both the model and the.
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COMSOL, COMSOL Desktop, COMSOL Multiphysics, Capture the Concept, and LiveLink . After a general introduction to the user interface, several tutorials. COMSOL, COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, and LiveLink the mesh parameters individually, as demonstrated in this tutorial. Berliner Str. 4 The COMSOL Multiphysics Geometry and CAD Environment. COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, This tutorial.
In our case stationary will be sufficient to find the steady state solution to this problem.
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As with the physics add the stationary study by left clicking on Stationary below the preset studies icon. Click the finish flag at the top right of the Model Wizard to finish startup. 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. This is just to the left of where the Model Wizard had been.
Before we continue with the Model Builder let us take a second to save our model. 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.
This file will be named Heat Transfer Example.
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. From this point on we can essentially just work our way down the Model Builders list of options filling in values and conditions where we need them. Geometry Now we are ready to add the geometry of the model.
This is very simple because our assumptions have placed the problem into only 2 dimensions. Our geometry consists of only of a rectangle. To create this rectangle first find the geometry icon in the model builder menus and right click it, this will bring up the menu shown at right. Find the Rectangle button in this new menu and left click this. At this point the rectangle has been added, however the dimensions of this rectangle need to be changed to fit the dimensions in the problem.
We do this by left clicking the white rectangle just to the left of the geometry icon. This will expand the geometry tab to show all the sub tabs contained within geometry. If you added the rectangle correctly you will see the tab called Rectangle 1. This contains all the information regarding this object and to adjust the dimensions and position of this rectangle this is where we do so.
Left click the tab labeled Rectangle 1.
If you have completed the above steps successfully your screen should resemble the one above. For this problem the height needs to be 5 cm 0. Enter these values into the designated fields and press the blue building icon at the top right of the rectangle menus.
This is the Build All button and will add your rectangle to the model. To get the graphical interface of COMSOL to center on the rectangle and adjust the axis bounds click the Zoom Extents button Materials To give the rectangle thermal properties such as heat capacity and thermal conductivity we can either add these directly under the Heat Transfer tab or by selecting a material to build the rectangle from. In this problem we will make our rectangle out of copper and we will do this using the Materials tab.
Left click on Materials tab and then left click Materials Browser. Your screen should look like the screen below. As can be seen above the Material Browser has a search bar that allows you to enter the name of the material in question and COMSOL will find any matches within its database.
Enter copper into the search bar and click search. Open the Built-In tab and then right click Copper. Your screen should now look like the one below. Left click Add Material to Model. You have now added copper to all domains by default which means the rectangle now has the properties of solid copper. It is under the Heat Transfer tab that the boundary, bulk and initial conditions for the equations of heat conduction can be input.
In our case we only have boundary conditions. Initial conditions are used in conjunction with time dependant studies and bulk conditions apply to the entire domain, not just a boundary. In our case we have on boundary in contact with the heated rod which is at k and all other boundaries in contact with the thermostat bathe at k. To input these boundary conditions first open the Heat Transfer tab by left clicking the white triangle to the left of the Heat Transfer icon. Your screen should look like this.
Right click the Heat Transfer icon to open a menu containing the various types of bulk and boundary conditions. Go through this menu and select Temperature by left clicking. A new icon will now appear under initial values that says Temperature this is where we will input one of our two temperature conditions.
Add another temperature boundary condition by repeating step 2. After adding the two temperature boundary conditions your look like the image to the right. We now need to specify a value and a location for our temperature boundary conditions.
Lets start with the warm surface. Start by left clicking Temperature 1. We need to do 2 things here. The first is to add the surface to which we wish to apply this boundary condition and the second is to give a value to this temperature. We will choose the bottom of our rectangle as the location for our boundary condition.
In the graphical interface left click this boundary which should then turn red as seen below and click the button to add. Now set the temperature to k by typing into the To field. If done properly your screen should look like this.
We now need to apply the cooler boundary condition. Do this by clicking Temperature 2 to open the interface and select the top and side boundaries to apply the boundary condition. Then enter into the To field. Your screen should look the one below. This concludes our activities within the Heat Transfer tab we can now proceed to calculate the solution.
Study To calculate the solution to our PDE we simply right click on the Study tab and click the green equals sign. After solving the PDE the temperature profile will be displayed as shown below. Results To display the temperature at a given point left click the point you wish to probe and the result will be displayed under the results tab as shown below.
To make a graph showing the temperature profile along a line we will need to add a cut line to our solution and display the temperature along it. This may be done as follows. Right click data sets under the results tab and select 2D cut line from the menu which will pop up. The two points defining the cut line need to be selected. In this case we will have our cut line start at point 0.
To do this enter these coordinates into the cut line 2D screen that will come up after left clicking on the Cut line 2D icon under the data sets tab. Your screen should look like the one at left. Press the paint brush button in the top right of the Cut line 2D screen to have the cut line displayed. Your cut line should look like the one below. We now need to add a 1D plot group to the results. So right click Results and left click the 1D plot group.
We want to add a line graph to our 1D plot group, so to do this right click on 1D Plot Group and choose Line Graph from the menu. This will add a line graph under the 1D plot group 6. This concludes our activities within the Heat Transfer tab we can now proceed to calculate the solution. We now need to apply the cooler boundary condition. Your screen should look the one below. If done properly your screen should look like this.
Then enter into the To field. After solving the PDE the temperature profile will be displayed as shown below. Results To display the temperature at a given point left click the point you wish to probe and the result will be displayed under the results tab as shown below.
Your cut line should look like the one below. Your screen should look like the one at left. This may be done as follows. To create the graph left click the paint brush button.
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You should obtain the following result. Adjusting The Problem At this point it is a simple matter to go back and change some of our boundary or bulk conditions. We do this as follows: We will do so now. As can be seen the temperature decreases linearly from the heated surface to the cooled surface.
We will start by changing the lateral surfaces to perfect insulators. You de-select a sub- domain by left clicking it and then pressing the minus button. By default now the lateral surfaces will be insulated. The below result should appear. If done correctly your constant temperature condition should look like the one below. We will use We need to add the domain over which this condition applies.
We will now add a heat generation term. Notice how only the region of the rectangle close to the lateral surfaces has changed from before.
Now a value for a per volume heat generation term needs to be added. So left click the rectangle and then left click the plus sign as done previously. This is a bulk condition and can be added in a similar way as the temperature boundary conditions. Left click this to open the interface. This should look like the one below. It is elucidating to examine the temperature profile for this solution so click on your previously made line graph displaying the temperature across the cut line. The below result should be obtained.
Example 1. Note how this differs from the solution without heat generation. To avoid redundancy only the steps that are significantly different from those in example 1 will be explained in detail. Materials Select Copper as the material and apply this to the geometry as before.
Geometry We will now create our geometry. This will take whatever geometry you create and rotate it about an axis and is ideal for problems with symmetry about an axis.
Right click geometry and add a rectangle. Heat Transfer We will use the same boundary conditions as before. Enter the appropriate temperatures in the temperature field and select the appropriate surfaces to apply these boundaries same as before. This is done by right clicking on heat transfer and clicking temperature.
Study Now that the model has been built we are ready to examine the solution. This is a pretty image but does not tell us much about the actual solution. Compare this solution to the solution from example 1.
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A Brief History of the Twenty-first Century. Jump to Page.This is a bulk condition and can be added in a similar way as the temperature boundary conditions. A reasonable mesh should not contain elements with quality below 0. Find the Rectangle button in this new menu and left click this. To identify parameters which best fit the given dataset we will use the following two step ap- proach: This contains all the information regarding this object and to adjust the dimensions and position of this rectangle this is where we do so.
We need to do 2 things here.