This article explains how to create a temperature difference plot using a formula field to compare results.
Details
Display the two sets of results you want to compare. On the Results tab, in the View Layout group, click Side by Side and select the results to display.
In this example, the temperature results are on two different meshes but at the same location in space.
Use the Synchronize View command.
Identify the results on the coarser mesh by clicking Identify Results in the Tools group. From the Pick list, choose Mesh and select the mesh on the model.
Create a field from the identified results by clicking Create Field.
In the Create Table Field dialog box, type the name of the field and specify the independent domain. In this example, coarsetemp is the name and the independent domain is Cartesian.
Identify the results and create a field for the finer mesh, using the same process.
In the Simulation Navigator, verify that the fields are created.
Create a new formula field for the temperature difference, by right-clicking Fields → New Fields → Formula.
In the Formula Field dialog box, type the name, for example tempdiff and click Next.
Search the dependent domain for the temperature difference. To do this, select Filter By Name from the Dependent list, type Temperature Difference, press Enter, and click Next.
From the Independent domain list, select Cartesian, the same as you defined for the fields and click Next.
Define a field that represents the difference of the two fields you previously defined for the coarse and fine meshes. To do this, double-click finetemps, type - ,double-click coarsetemp and click Accept Edit.
Generate a contour plot of the expression. To do this, choose Home tab → Checks and Information group → Plot Model Contours.
In the Expression To Plot group, type fd("tempdiff") and click OK.