Hello, Thanks to the answer
 

Hello,

Thanks to the answers to another user's question, I was able
to implement unsteady boundary conditions in "sonicFoam" by
changing the boundary values in the code itself.

The variables I want to change at the boundaries are velocity
and temperature. There are no problems with velocity.
However, since the solver solves for internal energy, I need
to modify the boundary value for internal energy, as changing
temperature alone would not be correct.

This is not a problem for this case. However, I am planning to
have unsteady boundary conditions on reacting cases, with multiple
species, and I was wondering if there is a more elegant way to
do this?

Would using the "timeVaryingUniformFixedValue" type for the
boundary conditions solve this problem?
I tried to use it based on the answer given to another question,
but I get this error:

BICCG: Solving for Ux, Initial residual = 1, Final residual = 1.10364e-16, No Iterations 1


--> FOAM FATAL IO ERROR : file "" does not exist

file: at line 1.

From function IFstream::operator()
in file db/IOstreams/Fstreams/IFstream.C at line 160.


Thank you for your help,

Kian

Hi Kian, I assume you are u
 

Hi Kian,

I assume you are using OpenFOAM-1.4 or 1.4.1.
You need specify filename in boundaryField.
An example for T field is as follows:
===
boundaryField
{
inlet
{
type timeVaryingUniformFixedValue;
timeDataFileName "inletTemp";
value uniform 315;
}
}
===
File "inletTemp" must be placed in "<root>" or
the filename must include relative path from
<root> when you execute "sonicFoam <root> <case>".

Masato

Hi Masato, Thanks for your
 

Hi Masato,

Thanks for your help, but this is exactly what I did, except that I am on 1.3.1. Could this be the problem?

Thanks,

Kian

Hello again, I was trying t
 

Hello again,

I was trying to avoid 1.4.1, but I compiled the source, and I still get the same error:

file "" does not exist

Any suggestions?

thanks,

Kian

Hi, Kian Sorry, this is not
 

Hi, Kian

Sorry, this is not a problem with versions.
For OF-1.3 and OF-1.4, I confirmed your problem
with sonicFoam & timeVarying..BC for T.

I found timevarying..BC works for
sonicTurbFoam using h.
In sonicTurbFoam, h is a data member of
basicThermo class. And basicThermo
calcualates h from T or T from h.
I guess timeVarying..BC for T works for another
applications using basicThermo class or derived
class of it.

Hello Masato, Thank you for
 

Hello Masato,

Thank you for you help, sonicTurbFoam does what I'm looking for.About the timeVaryingUniformFixedValue, I have found out that in sonicFoam, I can use it with the pressure boundary condition with no problems. However, when I do the same with temperature, I get this,

FOAM FATAL IO ERROR : file "" does not exist
, which looks like it does not read the file name in the temperature boundary condition.

Just curious.

Thanks,

Kian Mehravaran

Hi Kian, Explaining the dif
 

Hi Kian,

Explaining the different effect of
timeVaryingUniformFixedValue BC on T
for sonicFoam and sonicTurbFoam
( e=cv*T and thermo->h() ) is beyond
my understanding of FOAM.

I hope someone else will explain why.

Bests,
Masato