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Calculate the viscous forces on a patch

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Old   March 10, 2021, 03:53
Default Calculate the viscous forces on a patch
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Jinghong Su
Join Date: Mar 2021
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I am using foam-extend-3.2.
I want to obtain the forces and moments acting on a spherical particle in the channel flow. The forces and moments will be used to adjust the slip velocity on the particle surface. The forces are calculated by the script below and show to be different from the forces output by the

type patchExpression;
outputControlMode timeStep;
enabled true;
outputInterval 1;
patches (
// change to your name or names of patch
verbose true;
variables (
"pressure_forces= rho*p*normal()*area();"
"viscous_forces= -mu*snGrad(U)*area();"
expression "forces";
accumulations ( sum );

Thank you in advance.


Last edited by Su JH; April 3, 2021 at 04:21.
Su JH is offline   Reply With Quote


patch, sngrad, swak4foam, viscous force

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