surface contour: velocity magnitude?

alpharays786

Hi,

Anyone know why i cannot plot surface contour of velocity magnitude on wall surface of BC?
Because at inlet and outlet of BC, contour plot of velocity magnitude can be plot.

 

And, is there a way so that I can plot it? Because, certain cfd software can.

* I'm using Acusolve as solver and fieldview as post process

thanks

Altair Forum User

Hi alpharays786

 

It can't be plotted, I am afraid. 

ydigit

Not sure if I get your question correctly.

 

There is feature for velocity gradient at surface, called Surface Restricted Flow. Check 'Working With Fieldview' manual for details.

cfdguru

The velocity magnitude at a no-slip wall is zero.  You can certianly plot it in AcuFieldView, but the results won't be that interesting.  Since AcuSolve is finite element based, the nodes on the wall satisfy this constraint identically, and hence your results are zero.  Finite volume codes tend to plot the velocity magnitude at the cell center of the first element off the wall.  However, this is NOT the velocity at the wall.

alpharays786

Altair Forum User said:

The velocity magnitude at a no-slip wall is zero.  You can certianly plot it in AcuFieldView, but the results won't be that interesting.  Since AcuSolve is finite element based, the nodes on the wall satisfy this constraint identically, and hence your results are zero.  Finite volume codes tend to plot the velocity magnitude at the cell center of the first element off the wall.  However, this is NOT the velocity at the wall.

 

Understood, thank you for your explanation..

 

Then why hyperview manage to plot contour plot of velocity magnitude distribution at surface? using 'Velocity magnitude (Scalar value)' or 'Grad_velocity_dz (Mag)'?

 

Thanks

cfdguru

It is possible that HyperView is interpolating the solution to the cell centers to produce this contour.  AcuFieldView, however, does not do that.