CFD Online Discussion Forums

corrupted double-linked list

Posted February 21, 2017 at 13:04 by kindle

I copied a derived boundary condition from src/finiteVolume/fields/fvPatchFields/derived/turbulentInlet modified and recompiled it in user directory. It compiles and I name the new library libturbulentInletUser.
When using it in a simluation. Running the solver seems all right but I get "corrupted double-linked list" when I call "blockMesh" or "decomposePar".

In the source code, all classes in finiteVolume is compiled as a single library which contains...

kindle

New Member

Posted in Good habit, runtime

Views 1060 Comments 0 kindle is offline

LES: Turbulent Channel Flow without initial solution (BC)

Posted February 21, 2017 at 10:33 by kindle
Updated February 23, 2017 at 04:02 by kindle

In this post, the kinetic energy is monitered and the turbulentInlet condition is explained. We cannot use Reynolds averaged profile as inlet, because it is only seen by time average.

While monitering kinetic energy of all flow (not just the turbulent part), when this value tends to some stable state the mean and the turbulent part is then established.

Quote:

Originally Posted by Lieven

Hi Danesh,

Averaged profiles are not instantaneous profiles. You will never see them in real life as in 'hey

...

kindle

New Member

Posted in Pre-processing

Views 612 Comments 0 kindle is offline

Inlet velocity profile using swak4Foam

Posted February 16, 2017 at 05:29 by kindle

The problem of this is that groovy can impose an inlet profile but cannot take data downstream (this is the main difficulty) and then rescale to the entry. Adding fluctuation is straight forward.

Quote:

Originally Posted by zordiack

Hi, I wanted a fully developed inlet velocity profile for my 3D-case and I decided to implement it using swak4Foam since I couldn't figure out how to do it with native OpenFOAM tools. So, I thought I'd share my solution here since it took me a while to figure it out.

Please note

...

kindle

New Member

Posted in Pre-processing

Views 650 Comments 0 kindle is offline

Wall Function

Posted February 14, 2017 at 16:25 by bfox48

Quote:

Originally Posted by firb86

Does Flow 3D have a wall functions? How does the phenomenon solve when y+>5?

Best regards

When the turbulence models are turned on, then FLOW3D applies the logarithmic wall function in the cells intersecting a surface. It assumes the center of the cells is with the turbulent region of the logarithmic velocity profile, which is approx: 30<y+<1000.

Lots of explanation in the user manual.

bfox48

New Member

Posted in Uncategorized

Views 900 Comments 0 bfox48 is offline

fluent UDF parallel problem

Posted January 12, 2017 at 04:13 by tanpeilai

Quote:

Originally Posted by KevinZ09

Here's a UDF I think should work, though haven't tried it. Either way, give it a shot, or compare it with yours, and see if it works. If not, or yours doesn't, let me know.

Code:

#include "udf.h"
#define P_outlet_ID 2

  real flow;  /* defined outside because will be used in multiple DEFINE macros */

DEFINE_ADJUST(adjust, domain)
{

  /* "Parallelized" Sections */
  #if !RP_HOST  /* Compile

...

tanpeilai

New Member

Posted in Uncategorized

Views 1102 Comments 0 tanpeilai is offline