volTensorField
 

Hi,

I have the following code in OpenFoam:
I can't understand how I should interpret this expression? Could you please explain the terms in this expression?

Best regards

Okay, let's break it down. The main part of the line is:
This is declaring a volTensorField object tauMC, and initialising it with its name and its contents, where the latter is calculated from the <expression>.

The <expression> is made up as follows: firstly, the deviatoric strain rate (see https://cpp.openfoam.org/v8/TensorI_8H_source.html)
multiplied by the effective (laminar + turbulent) viscosity
multiplied by an expression that is either zero if the flow is inviscid or 1 if the flow is not inviscid:
So overall, it calculates the shear stress, setting it to zero if the inviscid flag is set.

Thanks a lot for the detailed explanation. I have now follow-up questions.


Where can I set muEff()?
What is the difference between nuEff() and muEff()?
Why does Temperature(T) appear in the following formulation of deviatoric strain rate? Best regards

Ok, you have a huge amount of reading to do, and to get anywhere with OpenFOAM you are going to have to learn to do your own research. Google is always useful, but also try and get to grips with the Doxygen pages, eg
https://cpp.openfoam.org/v8/. Search on there, and you will quickly find what muEff and nuEff are.

Tracking down the .T() will be more difficult, but I already gave you a link to the Tensor.H class ... maybe take a look in there?

I can easily answer your questions (time pernmitting) ... but it's a better strategy all round to help you answer your own questions, so take this as a challenge - any good luck my friend.