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Forum: OpenFOAM Running, Solving & CFD

September 19, 2008, 15:35

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

Hi Henrik, Yes, I can easil

Hi Henrik,

Yes, I can easilly believe that - the turbulence will enhance heat transfer. Worth checking this dimensionally though; the Prandtl number should be dimensionless, shouldn't it, so...

Forum: OpenFOAM Running, Solving & CFD

September 19, 2008, 10:16

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

\sigma=stress tensor (I think.

\sigma=stress tensor (I think...)

I'm guessing the viscous heating should roughly equal the viscous dissipation in turbulent flow. Or rather; any shear in the flow will dissipate energy through...

Forum: OpenFOAM Running, Solving & CFD

September 19, 2008, 09:31

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

Temem and Miranville give the

Temem and Miranville give the general energy equation as

rho De/Dt + q_i,i - \sigma_ij u_i,j = r

u_i,j = div(u) so this term = 0 in incompressible flow. q is the heat transfer by conduction...

Forum: OpenFOAM Running, Solving & CFD

September 19, 2008, 06:52

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

Henrik, I came to the concl

Henrik,

I came to the conclusion that the term should not be there if the fluid is incompressible. Temam and Miranville "Mathematical Modelling in Continuum Mechanics" (good book, btw) gives the...

Forum: OpenFOAM Running, Solving & CFD

September 17, 2008, 17:52

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

I had a look at the code at:

I had a look at the code at:

http://www.openfoamwiki.net/index.php/How_to_add_temperature_to_icoFoam

Am I right in thinking it misses off the viscous heating term??

Gavin

Forum: OpenFOAM Running, Solving & CFD

September 17, 2008, 11:15

Replies: 25

Heat transfer in liquid water suggestions for chioce of solver

Views: 6,183

Posted By grtabor

Hi. I would choose option 1

Hi.

I would choose option 1.; nonlinear density just adds to the complexity of solution, whereas an additional transport equation should be easy to include into turbFoam (or something similar). ...

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