# Setup of flat plate problem for laminar layer

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 August 7, 2011, 07:47 Setup of flat plate problem for laminar layer #1 Member   kostas Join Date: Jun 2010 Posts: 34 Rep Power: 7 Could someone to tell me what boundary conditions must be put at flat plate problem for laminar boundary layer? I have solved the problem with below boundary conditions but i see a problem (incresment of density) at left lower corner at which connect the left boundary with symmetry plane. Left boundary: specify: pressure, all velocities upper boundary: same of left right boundary: all gradients are zero left lower (x<0): symmetry right lower (x>0): viscous wall

 August 8, 2011, 19:43 #2 Senior Member   cfdnewbie Join Date: Mar 2010 Posts: 551 Rep Power: 11 sounds like you are overspecifying the lower left boundary, or you are having accuracy issues. a rise in density at that point means that you have created a stagnation point there, which is due to your flow coming from an Euler (symmetry wall) to a Navier Stokes (viscous) wall!

 August 9, 2011, 03:25 #3 New Member   aaaaaaaaaaaaaa Join Date: Apr 2011 Posts: 23 Rep Power: 6 No, i do not refer at stagnation point at connection of symmetry and wall but at start of symmetry plane (at left lower corner of domain). As i see , some information of domain arrive here and after increse the density except of reflection of information.

August 9, 2011, 17:37
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cfdnewbie
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Quote:
 Originally Posted by panou No, i do not refer at stagnation point at connection of symmetry and wall but at start of symmetry plane (at left lower corner of domain). As i see , some information of domain arrive here and after increse the density except of reflection of information.

Well, still, if you get a stagnation point (an unphysical one), you should check how the code sets the boundary conditions. Are they set twice at the point? Maybe there's a conflict, it sounds like you are over-constraining the flow there, e.g. what happens to the density in the symmetry BC routine?

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