# Set up a wind velocity for an experiment.

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 August 8, 2012, 02:20 Set up a wind velocity for an experiment. #1 New Member   Join Date: Aug 2012 Posts: 17 Rep Power: 7 Sponsored Links I'm using ElmerGUI as cfd software and I want to set up the velocity of the flow (wind). I understand this instruction of a tutorial is to create a parabolic profile of the flow in velocity 1... Model BoundaryCondition Name = Inlet Navier-Stokes Velocity 1 = Variable Coordinate 2; Real MATC "4* 1.5 * tx * (0.41-tx)/0.41^2" Velocity 2 = 0.0 Add New I understand that this equation (for a experiment 2D in a channel) "4* 1.5 * tx * (0.41-tx)/0.41^2" represents this profile: I would need a equation for this kind of profile: That is for a curve of a boundary layer. Someone know how will be the equation for this curve to work with Elmer?

 August 15, 2012, 08:17 #2 Senior Member   Rami Ben-Zvi Join Date: Mar 2009 Posts: 148 Rep Power: 10 Hi Bitacovir, I have no access to Elmer manuals at the moment, so forgive me if the syntax is not exact. Suppose - for example - that your axial velocity, U, is parabolic in the transverse coordinate, y, with U = 1*y^2 + 2*y + 3 then use \$A = 1. \$B = 2. \$C = 3. Velocity 1 = Variable Coordinate 2; Real MATC " \$A * tx^2 + \$B * tx + \$C" Sorry if I omitted a dollar or two... Rami Last edited by Rami; August 16, 2012 at 05:27.

August 16, 2012, 05:51
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Quote:
 Originally Posted by Rami Hi Bitacovir, I have no access to Elmer manuals at the moment, so forgive me if the syntax is not exact. Suppose - for example - that your axial velocity, U, is parabolic in the transverse coordinate, y, with U = 1*y^2 + 2*y + 3 then use \$A = 1. \$B = 2. \$C = 3. Velocity 1 = Variable Coordinate 2; Real MATC " \$A * tx^2 + \$B * tx + \$C" Sorry if I omitted a dollar or two... Rami
Dear Rami:

Thanks a lot. I going to try this suggestion. Currently I was using http://www.comflow.nl/ that is easier to set up Inlet conditions such as profile of wind.

Here one example that I was doing...

Kind Regards.

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