[lakeat]

Dear all,

version: 1.6

I met a problem, I'm not sure how to figure it out, in LES dynamic models,
it complains:
keyword filter is undefined in dictionary ""

without any infomation between the quotes, let's say in a channelFoam case.
filter simple
added in the LESProperties won't work, I'm not sure what is going wrong here.


Thanks for your patience. And BTW, I love version 1.6 very much. Turbulence models LES and RANS are reconstructed in a more consistent way, precisely reflecting the current RANS-LES tendency.

[lakeat]

Sorry for the disturbance, the solution is to add keyword:

filter simple

to the dict of dyn*Coeff, not dict of LESProperties.

Mea culpa

[ksteinmill]

Hi Daniel,

I've got the same problem.
I'm doing some comparisations of the different LESModels. With models "oneEqEddy" and "Smagorisnky" it works fine, but if I try dynSmagorinsky, I get the same error message.

keyword filter is undefined in dictionary ""

You said, you found a solution. Can you tell me, in which directory the dict-file is, where I can add the filter?

Thanks a lot.

Klaus

[lakeat]

easy,

add entry:

dynSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

[ksteinmill]

In which dict-file do I have to add this?
Because you wrote not in the LESProperties. Where else can I add it?

[ksteinmill]

Okay... sorry for disturbing.

I inserted it in LESProperties (allthough I thought I shouldn't) and it worked.

Thanks a lot!

[panda60]

Originally Posted by ksteinmill

Okay... sorry for disturbing.

I inserted it in LESProperties (allthough I thought I shouldn't) and it worked.

Thanks a lot!

Dear ksteinmill,

I don't know why dynSmagorinky model need k file ?

[lakeat]

I don't know why dynSmagorinky model need k file ?

In DS model, k is for calculating subgrid stress. As you can see from the source code. And Germano's paper.

[panda60]

Originally Posted by lakeat

In DS model, k is for calculating subgrid stress. As you can see from the source code. And Germano's paper.

Dear lakeat,

And how we could set k boundary condition?
If using RANS model, we can get inlet condition for k from experiment.
But in LES, how we set k for inlet condition ? or just use a small guess value ?

My dynSmagorinsky model always diverge, and don't know why.
Because I firft using Smagorinsky modek ,and then change to dynSmagorinsky model, and use the same dt, but several thousands later, the corrant number became larger and lager , and diverge.

Could you give me some suggestions ?

[lakeat]

Originally Posted by panda60

Dear lakeat,

And how we could set k boundary condition?
If using RANS model, we can get inlet condition for k from experiment.
But in LES, how we set k for inlet condition ? or just use a small guess value ?

My dynSmagorinsky model always diverge, and don't know why.
Because I firft using Smagorinsky modek ,and then change to dynSmagorinsky model, and use the same dt, but several thousands later, the corrant number became larger and lager , and diverge.

Could you give me some suggestions ?

a small value or not, that depends on your case, I perceive you are trying to use turbulent inlet, so k should not be arbitrarily set.
You know k have a definite physical meaning, it value reflects the turbulence intensity, so as you can imagine in a wind tunnel case, so I said it depends on your case.

Many cases are sensitive to inlet condition, such as flow past a cylinder, its separation under critical Re is very dependent on the inlet turbulence.

Concerning the diverge, don't be upset, check you mesh and check your boundary setting.

Cheers,

[libra]

Dear Daniel
I have got some problems running my case with Dynamic Smagorinsky model. I get this error "keyword filter is undefined in dictionary" and I have

dynamicSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

in constant/LES properties.
I don't know what the problem is!!!
Could you please help me with that.

Thanks a lot
Melika

[lakeat]

Originally Posted by libra

Dear Daniel
I have got some problems running my case with Dynamic Smagorinsky model. I get this error "keyword filter is undefined in dictionary" and I have

dynamicSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

in constant/LES properties.
I don't know what the problem is!!!
Could you please help me with that.

Thanks a lot
Melika

Really?? Could you pls paste all the error msg here?

[libra]

Dear Daniel
Thanks for your reply.
This is what I get:

Create time

Create mesh for time = 2.092

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type LESModel
Selecting LES turbulence model dynSmagorinsky
[2]
[2]
[2] --> FOAM FATAL IO ERROR:
[2] keyword filter is undefined in dictionary "/home/naka/OpenFOAM/naka-1.6.x/run/melika/case12/processor2/constant/LESProperties::dynSmagorinskyCoeffs"
[2]
[2] file: /home/naka/OpenFOAM/naka-1.6.x/run/melika/case12/processor2/constant/LESProperties::dynSmagorinskyCoeffs from line 0 to line 0.
[2]
[2] From function dictionary::lookupEntry(const word&, bool, bool) const
[2] in file db/dictionary/dictionary.C at line 396.
[2]
FOAM parallel run exiting
[2]
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 2 in communicator MPI_COMM_WORLD
with errorcode 1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun has exited due to process rank 2 with PID 704 on
node olcs02 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------

I hope it helps.

[lakeat]

Typo????

Replace

dynamicSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

with

dynSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

[libra]

Thanks a lot Daniel.
It is working now.

[lakeat]

next time get some coffee b4 programming

[Nicole Yu]

Originally Posted by libra

Dear Daniel
I have got some problems running my case with Dynamic Smagorinsky model. I get this error "keyword filter is undefined in dictionary" and I have

dynamicSmagorinskyCoeffs
{
filter simple;
ce 1.048;
}

in constant/LES properties.
I don't know what the problem is!!!
Could you please help me with that.

Thanks a lot
Melika

I also got the same erro, try to extract filter out of the braket like this:
filter simple;

dynamicSmagorinskyCoeffs
{
ce 1.048;
}