SU2 Compressible Solver Freestream Vector Definition

bndrylyr · December 16, 2023, 15:51

Is there a way to define an arbitrary freestream vector (i.e., [u, v, w]) for the compressible solver rather than alpha/beta? This adds complexity to the process when running cases that do not align with the SU2 coordinate frame.

bigfootedrockmidget · December 19, 2023, 07:39

I do not see how introducing [U,V,W] reduces complexity compared to working with [Ma,alpha,beta], since the usual measure of velocity is the Mach number for compressible flows.
It is not possible to work with freestream values [U,V,W] in SU2 (for compressible flows, it is possible for incompressible flow).

bndrylyr · January 5, 2024, 00:56

The velocity magnitude could still be defined by Mach number, I'm referring to the direction of the velocity vector, [u/U, v/U, w/U] (defined as a normalized vector rather than two angles). Say you're working on a geometry with some X, Y, Z coordinate system and want the flow to be going in the negative X direction; currently that requires (as far as I know) defining an angle of attack of 180 degrees, and any angle of attack relative to that must be calculated WRT 180. The ability to define a normalized freestream vector, (e.g. something like [0.7071, 0.7071, 0]), would be more flexible for a wider variety of problems. Just a thought; I didn't see this functionality in the docs but wanted to check if it existed.

December 16, 2023, 15:51	SU2 Compressible Solver Freestream Vector Definition	#1
bndrylyr New Member Join Date: Mar 2017 Posts: 5 Rep Power: 9	Is there a way to define an arbitrary freestream vector (i.e., [u, v, w]) for the compressible solver rather than alpha/beta? This adds complexity to the process when running cases that do not align with the SU2 coordinate frame.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Static FSI with Compressible Flow (SU2 7.1.1)	sangeet	SU2	3	April 4, 2021 16:28
PEMFC model with FLUENT	brahimchoice	FLUENT	22	April 19, 2020 15:44
fluent divergence for no reason	sufjanst	FLUENT	2	March 23, 2016 16:08
Difference between Compressible CFD solver and Incompressible CFD solver	arijith	Main CFD Forum	6	September 23, 2012 19:23
Creating New Solver: For particle-laden compressible jets	sankarv	OpenFOAM	0	April 4, 2010 18:06

December 19, 2023, 07:39		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 620 Rep Power: 18	I do not see how introducing [U,V,W] reduces complexity compared to working with [Ma,alpha,beta], since the usual measure of velocity is the Mach number for compressible flows. It is not possible to work with freestream values [U,V,W] in SU2 (for compressible flows, it is possible for incompressible flow).

January 5, 2024, 00:56		#3
bndrylyr New Member Join Date: Mar 2017 Posts: 5 Rep Power: 9	The velocity magnitude could still be defined by Mach number, I'm referring to the direction of the velocity vector, [u/U, v/U, w/U] (defined as a normalized vector rather than two angles). Say you're working on a geometry with some X, Y, Z coordinate system and want the flow to be going in the negative X direction; currently that requires (as far as I know) defining an angle of attack of 180 degrees, and any angle of attack relative to that must be calculated WRT 180. The ability to define a normalized freestream vector, (e.g. something like [0.7071, 0.7071, 0]), would be more flexible for a wider variety of problems. Just a thought; I didn't see this functionality in the docs but wanted to check if it existed.