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A generalized thermal/dynamic wall function: Part 2

Posted October 17, 2016 at 08:24 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:07 by sbaffini

In the first part of this post we left with the problem of computing the following integral:

f^+\left(y^+,\frac{Pr}{Pr_t}\right)=\int_0^{y+}{\frac{1}{\left[1+\left(\frac{Pr}{Pr_t}\right)\left(\frac{\mu_t}{\mu}\right)\right]}dz^+}

with:

\frac{\mu_t}{\mu}\left(y^+,a,k\right)=\frac{\left(ky^+\right)^3}{\left(ky^+\right)^2+\left(ka\right)^3-\left(ka\right)^2}

I added all the explicit functional dependencies here because we know f^+\left(y^+,1\right)...
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Old

A generalized thermal/dynamic wall function: Part 1

Posted October 14, 2016 at 12:27 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:07 by sbaffini

In a previous post i wrote about an extension of the Reichardt law of the wall to pressure gradient effects. That was derived by assuming the Reichardt profile as a solution for the case without pressure gradient and using integration by parts. In particular, given the the Reichardt function (k is the Von Karman constant):

f^+\left(y^+\right) = \frac{1}{k}\log\left(1+ky^+\right) +A\left(1-e^{-\frac{y^+}{B}}-\frac{y^+}{B}e^{-\frac{y^+}{C}}\right)

with:
...
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pimpleFoam vs simpleFoam vs pisoFoam vs icoFoam?

Posted October 14, 2016 at 11:27 by kindle
Updated October 24, 2016 at 11:37 by kindle

Quite confusing sometime !

But, why is that a problem needs boundary condition for U and p and all the other possible variables?

pisoFoam has relaxation coef while icoFoam does not have this.
Quote:
UEqn.relax();

Quote:
Originally Posted by ata View Post
Hi
icoFoam is transient solver for incompressible, laminar flow of Newtonian fluids.

pimpleFoam is large time-step transient solver for incompressible, flow using the PIMPLE(merged PISO-SIMPLE) algorithm.
...
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Viscoelastic Fluid Flows using OpenFOAM The solver viscoelasticFluidFoam

Posted October 14, 2016 at 11:27 by kindle

This guy use Openfoam and FENE-P !!!

Quote:
Originally Posted by mmasoudian View Post
Dear ata
I appreciate your quick answer
I compiled everything and I changed fvSolutions as you mentioned in forum but when I want to run a case (FENE-P): the error is:


mam@ubuntu:~/OpenFOAM/mam-2.0.0/RUN/tutorials/incompressible/viscoelasticFluidFoam/FENE-P$ viscoelasticFluidFoam
/*---------------------------------------------------------------------------*\
| ========= |
...
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PyFoam

Posted October 12, 2016 at 11:41 by kindle
Updated October 14, 2016 at 10:03 by kindle

4.8 GUI-Tools

4.8.1 pyFoamDisplayBlockMesh.py

Graphically displays a blockMesh and helps highlights selected blocks and patches. It is not a blockMesh-editor, but it helps to find errors in the order of vertices etc (editing of the blockMesh is still done in a text editor).
This needs an installation of the VTK with Python-bindings. The ways to get this are very different on various systems. But usually you have to compile it from the sources. Sorry.
Since...
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