Boundary Layer Question

scottneh · September 28, 2010, 19:38

Hello,

I am using Star CCM+ 5.04 and I am trying to simulate a boundary layer over a flat plate with a wedge in the middle. I would like to have an accurate simulation of the boundary layer and how to build the boundary layer. I see that I have to input the height of the boundary layer and the number of layers but I really don't know what the real boundary layer would look like if I built the model and put it in a wind tunnel.

Can anyone offer any insight into how one goes about selecting these parameters?

Thanks
Scott

nomad · September 30, 2010, 13:50

I would setup an initial arbitrary mesh, sun the simulation, look at what's happening to the flow, then remesh accordingly depending on what flow structure develops where.

scottneh · September 30, 2010, 13:56

An arbitrary mesh for where I think the boundary layer is? I have a mesh for the overall flow volume. Would I turn on the prism layer and define arbitrary thickness and number of layers?

Thanks
Scott

nomad · September 30, 2010, 14:21

Yes, start with a few prism layers covering the edges and intersections of the wedge and the plate, then add or refine the prism layers as necessary.

September 28, 2010, 19:38	Boundary Layer Question	#1
scottneh Member Scott Join Date: Sep 2009 Posts: 30 Rep Power: 16	Hello, I am using Star CCM+ 5.04 and I am trying to simulate a boundary layer over a flat plate with a wedge in the middle. I would like to have an accurate simulation of the boundary layer and how to build the boundary layer. I see that I have to input the height of the boundary layer and the number of layers but I really don't know what the real boundary layer would look like if I built the model and put it in a wind tunnel. Can anyone offer any insight into how one goes about selecting these parameters? Thanks Scott

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September 30, 2010, 13:50		#2
nomad Member John Join Date: Aug 2009 Posts: 92 Rep Power: 16	I would setup an initial arbitrary mesh, sun the simulation, look at what's happening to the flow, then remesh accordingly depending on what flow structure develops where.

September 30, 2010, 13:56		#3
scottneh Member Scott Join Date: Sep 2009 Posts: 30 Rep Power: 16	An arbitrary mesh for where I think the boundary layer is? I have a mesh for the overall flow volume. Would I turn on the prism layer and define arbitrary thickness and number of layers? Thanks Scott

September 30, 2010, 14:21		#4
nomad Member John Join Date: Aug 2009 Posts: 92 Rep Power: 16	Yes, start with a few prism layers covering the edges and intersections of the wedge and the plate, then add or refine the prism layers as necessary.