Inviscid solution gives different results for Constant Density and Incompressible -- CFD Online Discussion Forums

October 31, 2019, 15:41	Inviscid solution gives different results for Constant Density and Incompressible	#1
wildabyss New Member Jimmy Join Date: Feb 2011 Posts: 9 Rep Power: 15	I'm running Fluent on a very low speed (M~0.05) 3D airplane model using the inviscid mode. For Materials, I tried both Constant Density (rho = 1.225kg/cu.m) and Incompressible-Ideal-Gas (Po = 101325Pa, MW=28.966kg/kmol, T0=288.15K, so it should give a density of approximately 1.225). However, with Constant Density, I'm getting a CL of 1.22, which is very close to the VLM result; with Incompressible-Ideal-Gas, I'm getting 1.4. The pitching moment is also sufficiently different. Why the big difference in results? Note that since it's running inviscid solution, the mesh is all tetra and has no prism layer.

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