OpenFOAM solver for incompressible BUT temperature dependent flow

niko0807 · October 7, 2015, 12:57

Hello,

I am modeling heat transfer in a tube bank heat exchanger - primarily from surface to air. The temperature differences are as large as 180 K throughout the domain.

I have investegated the possibility of solving the flow as incompressible with buoyantBoussinesqPimpleFoam but concluded that variations in nu (about 50 %) are to big to assume constant viscosity.

Velocities are low and the static pressure variation negligible. Therefore, I am keen on knowing whether there is a thermal incompressible solver where the viscosity can be made temperature dependent (with polynomials for example).

Does anyone know about a thermal incompressible solver where viscosity can be made temperature dependent?

tas38 · October 7, 2015, 15:34

You can write your own solver to account for temperature variation of viscosity,
for example. See the link below for a report that may provide some useful
guidance.

http://www.tfd.chalmers.se/~hani/kur...nFoam%20v2.pdf

agustinvo · October 27, 2015, 06:31

Hello

I am dealing as well with natural convection problems, and I have to use polynomials to define my transport properties. I will perform LES on it.

I was able to create it, but I have some problems: I can't see an unsteady flow! It keeps laminar, steady. It must be related with my solver, but I have no more idea.

In any case, you can take a look as well to this:
http://www.cfd-online.com/Forums/ope...roperties.html

Where I talk about a compressible solver used as an incompressible one. It's not what we are looking for, but it is still something.

October 7, 2015, 12:57	OpenFOAM solver for incompressible BUT temperature dependent flow	#1
niko0807 New Member Nikolai Tauber Join Date: Sep 2015 Location: Aarhus, Denmark Posts: 14 Rep Power: 11	Hello, I am modeling heat transfer in a tube bank heat exchanger - primarily from surface to air. The temperature differences are as large as 180 K throughout the domain. I have investegated the possibility of solving the flow as incompressible with buoyantBoussinesqPimpleFoam but concluded that variations in nu (about 50 %) are to big to assume constant viscosity. Velocities are low and the static pressure variation negligible. Therefore, I am keen on knowing whether there is a thermal incompressible solver where the viscosity can be made temperature dependent (with polynomials for example). Does anyone know about a thermal incompressible solver where viscosity can be made temperature dependent?

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October 7, 2015, 15:34		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 220 Rep Power: 19	You can write your own solver to account for temperature variation of viscosity, for example. See the link below for a report that may provide some useful guidance. http://www.tfd.chalmers.se/~hani/kur...nFoam%20v2.pdf

October 27, 2015, 06:31		#3
agustinvo Senior Member Agustín Villa Join Date: Apr 2013 Location: Alcorcón Posts: 314 Rep Power: 15	Hello I am dealing as well with natural convection problems, and I have to use polynomials to define my transport properties. I will perform LES on it. I was able to create it, but I have some problems: I can't see an unsteady flow! It keeps laminar, steady. It must be related with my solver, but I have no more idea. In any case, you can take a look as well to this: http://www.cfd-online.com/Forums/ope...roperties.html Where I talk about a compressible solver used as an incompressible one. It's not what we are looking for, but it is still something.