# How to give out U in ratio to inflow-velocity

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 March 8, 2011, 08:06 How to give out U in ratio to inflow-velocity #1 Member   Martin Join Date: Aug 2010 Location: Germany Posts: 55 Rep Power: 8 Dear community, is there a chance to give out the velocity of each field in ratio to the inflow velocity (standardize) it and make it visible in paraView? Maybe with foamCalc? But i have no idea about the syntax? Could someone help me? thank you very much Martin

 March 8, 2011, 08:16 #2 Senior Member   Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 14 You can choose U at your inlet to be 1, and scale your viscosity accordingly? When you normalize your Navier-Stokes equations, it should be not too difficult.

 March 8, 2011, 08:24 #3 Member   Martin Join Date: Aug 2010 Location: Germany Posts: 55 Rep Power: 8 Thank you very much for you answer. I do not really understand what you mean. It is a post-process work. So i wont make in inflow of 1. Or do you mean, it is possible to scale this in paraView? If you mean this, could you tell me how to do it?

 March 8, 2011, 10:42 #4 Senior Member   Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 14 Well, it depends on what you want to achieven. Of course it can be done in Paraview as well (Calculator of Python Calculator filter). You can also try to solve the non-dimensional Navier-Stokes equations in OpenFOAM, that is equivalent.

 March 9, 2011, 05:16 #5 Member   Martin Join Date: Aug 2010 Location: Germany Posts: 55 Rep Power: 8 Dear Bernhard, that was helpful, thank you. I used foamCalc to get magU (a scalar) and having this i was able to take the calculator filter to calculate magU/inflow velocity!!! Thank you very much Martin

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