At an opening in turbulent flow, using wall boundary condition, with constant flow rate and constant pressure inlet, would be similar to an opening with inflow BC?
Hi !
Here I'm trying to answer whatever I could figure out from the question " Is a wall with constant inlet pressure and constant inflow similar to an opening ? "
As per the classical fluid mechanics / fluid dynamics no opening can ever simulate a wall or a confined volume of fluid despite the fact that the fluid is at constant inlet pressure and constant inflow since although the opening is at a constant inlet pressure / inflow still there exists certain pressure above the datum which can't simulate the inflow boundary conditions.
The lower edge of a hypothetical inviscid fluid of uniform velocity that has the same flow rate as occurs in the real fluid with the boundary layer experiences a pressure & a velocity gradient as well.
Be it the point where the velocity profile essentially reaches the asymptotic velocity as the boundary layer thickness ( velocity boundary layer thickness, displacement thickness or the momentum thickness ), its impossible to define an exact location at which the velocity profile reaches the asymptotic velocity in a boundary in the case of an inflow irrespective of the laminar / turbulent flow ( based on physiological occurrence or direction of flow ).
THANKS !
Well, If I define a constant flow rate, and constant pressure as boundary conditions for a wall-type boundary in my simulation, would the result for velocity and pressure field be similar to that if i define the same BC but this time change the boundary type to inlet-type?
I still do not understand your question, if you have a wall boundary condition, the pressure on the wall is a result of your flow condition, you cannot set it. And what do you mean for a constant flow rate on a wall?
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