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#1 |
Senior Member
Raza Javed
Join Date: Apr 2019
Location: Germany
Posts: 183
Rep Power: 8 ![]() |
Hello Everyone,
I have a question that, If I have Turbulent fluid flow from a pipe, Can I use noSlip boundary condition for velocity(U) at the walls of the pipe? I shall be very thankful for your helpful response. Thank you |
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#2 |
Member
Ingo Riess
Join Date: Jun 2019
Location: Switzerland
Posts: 40
Rep Power: 8 ![]() |
I am currently building a case where I initially used noSlip boundary condition on the side walls. It gave me a considerable and grid-dependent pressure drop through my system. Now I changed to nutkWallFunction and then to nutkRoughWallFunction. Both gave me more reasonable pressure drop. I assume, for noSlip boundary condition you have to resolve the boundary layer with your grid... and possibly be careful with the selection of the turbulence model.
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#3 | |
Senior Member
Raza Javed
Join Date: Apr 2019
Location: Germany
Posts: 183
Rep Power: 8 ![]() |
Quote:
Thank you so much for your reply. Can we use nutkwallfunction or other wallFunctions for velocity boundary conditions as well? I thought we can only use them for 'k' in turbulence modelling. |
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#4 |
Member
Ingo Riess
Join Date: Jun 2019
Location: Switzerland
Posts: 40
Rep Power: 8 ![]() |
I see, you're right. I use noSlip for 'U', nutkRoughWallFunction for 'nut' and kqRWallFunction for 'k'. Not sure if this is right. At least, the pressure drop in my system appears reasonable.
![]() There are so many tutorials on meshing and application selection - I wish there'd be more on boundary conditions. |
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Tags |
boundary conditions, noslip, openfoam, turbulent flow, velocity |
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