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Old   December 11, 2017, 02:11
Default calculating forces
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A. Min
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Hi all
I saw in forces code that shear stress is calculated by:

shear stress = - mu*gama

in code:
-rho()*nu*dev(twoSymm(fvc::grad(U)))

what is the minus in this formula?
Now I want to calculate forces for viscoelastic fluid. should I write:

total shear stress = -tau - mu*gama

that tau is polymeric stress.

Thanks
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forces, forces and force coeff., shear stress

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