Need help with boundary conditions

niklas · December 9, 2005, 07:44

try zeroGradient for pressure at inlet and wall

N

ploceus · December 9, 2005, 14:22

Hi. I changed boundary condition as you suggested. My simulation still
blows up. The Courant numbers always start with small like shown below,

Mean and max Courant Numbers = 1.06693e-14 5.67538e-14

These numbers diverges to infinity later in time. I tried using
several different time steps but still have same behavior. Does
wrong boundary condition cause this symptom? or is it caused by
something else.. like maybe using wrong scheme?

Thanks again.

December 9, 2005, 07:44	try zeroGradient for pressure	#1
niklas Super Moderator Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 29	try zeroGradient for pressure at inlet and wall N

December 9, 2005, 14:22	Hi. I changed boundary conditi	#2
ploceus New Member Charles Ju Join Date: Mar 2009 Posts: 15 Rep Power: 17	Hi. I changed boundary condition as you suggested. My simulation still blows up. The Courant numbers always start with small like shown below, Mean and max Courant Numbers = 1.06693e-14 5.67538e-14 These numbers diverges to infinity later in time. I tried using several different time steps but still have same behavior. Does wrong boundary condition cause this symptom? or is it caused by something else.. like maybe using wrong scheme? Thanks again.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Burgerbs equation non constant Boundary Conditions Initial Conditions	arkangel	OpenFOAM Running, Solving & CFD	1	October 2, 2008 15:48
Boundary conditions for turbulent boundary layer	Thomas	FLUENT	1	June 17, 2008 06:14
boundary conditions for boundary layer flow	A. Al-zoubi	CFX	0	November 3, 2007 08:11
Integral boundary conditions turbulent intensitylength boundary conditions	olesen	OpenFOAM Running, Solving & CFD	0	July 27, 2006 08:18
boundary conditions	Jason Jordan	FLUENT	0	June 26, 2001 18:12