I need to calculate the scalar product between the operator Nabla and the matrix representing the strain rate tensor using Fluent. Does someone know how to do it easily, without coding every term?
you need only to do this steps :
Reports:
Report Type : Vertex Average
Field Variable : Derivatives / Strain Rate
Then select the surface or the volume you want to determine the strain rate in => Compute
many thanks but I think that your answer is valid in postprocessing. I need to calculate it for an UDS and at each iteration.
The best way for that is to create a surface monitor under "Solution" section. I put below the different steps to perform a monitor surface:
Solution > Surfaces Monitors > Create > Report Type (Vertex Average) > Field Variable (Derivatives/Strain Rate) > OK
There are some useful options like : Get Data Every (you specify the number of iterations after which you want to get the strain rate. Also, it is possible to have a backaup by activating the option "write" ...
Once you set up this surface monitor, Fluent will launch a second supervisor window in which you can follow up the evolution of the solution in term of "strain rate"
I think that's possible to create more than one surface monitor...
thank, but the term Nabla.Strain Rate is a source term in an equation defined by an UDS. So it is not in postprocessing.
The use of a User Defined Function seems relevant ... I found in the Fluent library the function C_STRAIN_RATE_MG(c,t) that allows you to get the Strain Rate Magnitude
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