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-   -   Forces viscous calculation in VWT with OpenFOAM 15x (http://www.cfd-online.com/Forums/openfoam-solving/58270-forces-viscous-calculation-vwt-openfoam-15x.html)

terrybarnaby November 28, 2008 09:39

Hi, I am trying to update my s
 
Hi, I am trying to update my simple VWT simulation from OpenFOAM 1.4.1 to 1.5.x. All appears reasonable except for the Forces viscous calculation made in simpleFoam using the forces function.

If my object is close to one of the walls (the road surface), the viscous force calculation result builds up over each simpleFoam time iteration, it does not appear to converge. The pressure force seems Ok. This did not happen in OpenFOAM 1.4.1 with the liftDrag utility.
With a simple cube, close to the "road", I am getting a final result, after 80 iterations, of:
forces output:
forces(pressure, viscous)((137.014 -5.47483e-06 137.545) (1850.53 1.1884e-05 16.0829))
moment(pressure, viscous)((-4.61107e-05 315.43 8.11586e-06) (1.12126e-06 40.5567 0.000137856))


I expect there is an issue with my case setup, I wonder if anyone could run an eye over my case and see what I am doing wrong ?

http://www.cfd-online.com/OpenFOAM_D...hment_icon.gif vwtTest9.tar.gz


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