Strain Rate in Non-Isothermal Fluid Physics in COMSOL

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Dear COMSOL Community,

I am currently working on a Non-Isothermal Fluid Flow simulation in COMSOL where I prescribe certain velocity field boundary conditions and solve for the velocity field as a function of time. I would like to plot the normal strain rate with time but I could not find an expression for the strain rate.

Any suggestions or insights would be greatly appreciated!

Best regards, Ahmed


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