dsmc properties

hyperion · August 4, 2010, 02:12

Hi there fellow foamers - I have a few few questions:

1) some of the boundary conditions that need to be defined seem to conflict. Why would I need to define rhoM, rhoN, and dsmcrhoN at the boundaries. It seems like the defining just one would suffice since the /constants/dsmcProperties file defines things like molecular mass and nequivalentParticles. I know I can use keyword calculated, but when I have doen this in the tutorial case freespaceStream the simulation stops after the first write step (t=.oo1).

2) Has anyone been able to use netgenNeutralToFoam when running dsmc cases? My cases always crash at the dsmcInitialise step.

3) Is the force density (fD) boundary condition basically just a pressure specification?

That's it for now. Thanks for any and all help.

archymedes · August 19, 2010, 09:58

I've asked my self the same question ( point 1) and also if there is any ranking, so to say if two inputs are in conflict which one is preferred.

August 4, 2010, 02:12	dsmc properties	#1
hyperion Member Daniel Join Date: Jul 2010 Location: California Posts: 39 Rep Power: 15	Hi there fellow foamers - I have a few few questions: 1) some of the boundary conditions that need to be defined seem to conflict. Why would I need to define rhoM, rhoN, and dsmcrhoN at the boundaries. It seems like the defining just one would suffice since the /constants/dsmcProperties file defines things like molecular mass and nequivalentParticles. I know I can use keyword calculated, but when I have doen this in the tutorial case freespaceStream the simulation stops after the first write step (t=.oo1). 2) Has anyone been able to use netgenNeutralToFoam when running dsmc cases? My cases always crash at the dsmcInitialise step. 3) Is the force density (fD) boundary condition basically just a pressure specification? That's it for now. Thanks for any and all help. Kevin Cao likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
Chemical properties that are used in Fluent	kimej	FLUENT	4	August 19, 2011 11:29
Constant velocity of the material	Sas	CFX	15	July 13, 2010 08:56
Properties of air versus temperature AND pressure	Vincent	Main CFD Forum	5	July 28, 2008 06:28
Two-Phase Buoyant Flow Issue	Miguel Baritto	CFX	4	August 31, 2006 12:02

August 19, 2010, 09:58		#2
archymedes Member Claus Schmitzer Join Date: Mar 2010 Posts: 30 Rep Power: 16	I've asked my self the same question ( point 1) and also if there is any ranking, so to say if two inputs are in conflict which one is preferred.