query to determine shape of a pressure far field

alastormoody11 · July 26, 2009, 08:14

Hi,

I am simulating a flow over an airfoil having surface perturbations in a wind tunnel. It is flow with Reynolds number 2,00,000 to 3,50,000. I am confused whether the shape of the boundary(through which the flow is coming in) in the 2D simulation should be parabolic, semicircular with two edges or the various other shapes illustrated in the various mesh files shown in Gambit or ICEM CFD tutorials.

gerritgroot · July 28, 2009, 06:37

It shouldn't matter as long as it's far away. If you make the grid by constructing blocks on the geometry, people tend to use a shape that's similar to the geometry, so a sort of dick contour lines in your case.

If you use a grid generator like Icem-CFD where you have to cut the geometry away from the domain, people tend to use ugly cubes, because for beginners it's hard to get rid of the cartesian rectangular lines made by ICEM in the starting blocking (use O-grids)

July 26, 2009, 08:14	query to determine shape of a pressure far field	#1
alastormoody11 Senior Member Join Date: Jun 2009 Posts: 100 Rep Power: 16	Hi, I am simulating a flow over an airfoil having surface perturbations in a wind tunnel. It is flow with Reynolds number 2,00,000 to 3,50,000. I am confused whether the shape of the boundary(through which the flow is coming in) in the 2D simulation should be parabolic, semicircular with two edges or the various other shapes illustrated in the various mesh files shown in Gambit or ICEM CFD tutorials.

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July 28, 2009, 06:37		#2
gerritgroot Member Anonymous Join Date: Jul 2009 Posts: 44 Rep Power: 16	It shouldn't matter as long as it's far away. If you make the grid by constructing blocks on the geometry, people tend to use a shape that's similar to the geometry, so a sort of dick contour lines in your case. If you use a grid generator like Icem-CFD where you have to cut the geometry away from the domain, people tend to use ugly cubes, because for beginners it's hard to get rid of the cartesian rectangular lines made by ICEM in the starting blocking (use O-grids)