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

October 31, 2019, 16:41	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.

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are On Refbacks are On Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Inviscid solution gives different results for Constant Density and Incompressible	wildabyss	FLUENT	0	October 30, 2019 22:18
Ahmed body simulation gives unexpected results in su2 6.0	anas651	SU2	0	March 28, 2018 04:42
Continuing incompressible results with compressible solver	linkamp	OpenFOAM Running, Solving & CFD	0	July 22, 2016 09:54
(incompressible) interFoam - where is the density in the k, epsilon and continuity eq	idefix	OpenFOAM	0	December 22, 2015 15:40
Help : Algorithm for incompressible variable density flows	Meeranandan	Main CFD Forum	0	February 6, 2013 07:55

All times are GMT -4. The time now is 14:24.