Forced convection and CHT : can we disable pressure and velocity solvers ?

M3hdi · April 4, 2012, 09:09

Hi everybody,

I would like to simulate a Conjugate Heat Transfer problem where the fluid properties (density and viscosity) are independent of temperature. It is a forced convection case. Suppose I already get the pressure and velocity fields through a steady state simulation in the fluid region.

The question is: can I run a CHT simulation (with time varying T boundary conditions) where p and U are initialized by the steady state solution and only energy equations are solved (in the fluid and solid regions with heat transfer). I can do so by setting the target residue of the pressure and velocity equations to 1.

Is this correct ? This proceedure could save a lot of CPU time

Thank u for your help.
M3hdi

M3hdi · April 5, 2012, 09:27

..the underlying hypothesis would be that the temperature field does not change the pressure and velocity solutions. Is this correct in a physical point of view ? (for incompressible fluid with constant density and viscosity)

M3hdi · May 31, 2012, 04:42

... none ?

JBeilke · May 31, 2012, 08:04

That's a usual way to deal with that problem. So try it and look if you get reasonable results.

M3hdi · May 31, 2012, 08:57

Thank you for the answer !

April 4, 2012, 09:09	Forced convection and CHT : can we disable pressure and velocity solvers ?	#1
M3hdi New Member Join Date: Aug 2011 Location: Paris Posts: 20 Rep Power: 14	Hi everybody, I would like to simulate a Conjugate Heat Transfer problem where the fluid properties (density and viscosity) are independent of temperature. It is a forced convection case. Suppose I already get the pressure and velocity fields through a steady state simulation in the fluid region. The question is: can I run a CHT simulation (with time varying T boundary conditions) where p and U are initialized by the steady state solution and only energy equations are solved (in the fluid and solid regions with heat transfer). I can do so by setting the target residue of the pressure and velocity equations to 1. Is this correct ? This proceedure could save a lot of CPU time Thank u for your help. M3hdi

April 5, 2012, 09:27		#2
M3hdi New Member Join Date: Aug 2011 Location: Paris Posts: 20 Rep Power: 14	..the underlying hypothesis would be that the temperature field does not change the pressure and velocity solutions. Is this correct in a physical point of view ? (for incompressible fluid with constant density and viscosity)

May 31, 2012, 04:42		#3
M3hdi New Member Join Date: Aug 2011 Location: Paris Posts: 20 Rep Power: 14	... none ?

May 31, 2012, 08:04		#4
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 498 Rep Power: 20	That's a usual way to deal with that problem. So try it and look if you get reasonable results.

May 31, 2012, 08:57		#5
M3hdi New Member Join Date: Aug 2011 Location: Paris Posts: 20 Rep Power: 14	Thank you for the answer !