code_saturne User's Forum

Hello Yvan,

Sorry I do not understand well, so let me check.

What I want to do now is
Step 1 - make an average velocity field in some way (total 18000 steps, and calculate the average from 6000step to 18000step)
Step 2 - Solve scalar transport on the average velocity using URANS. (Here I want to ...

Hello Yvan,

Thank you for your quick response.

As you said, what I want to do now is to switch PRANS to URNAS before and after restarting.
I know this bag does not occur when I used PRANS (or URANS) both before and after restarting.
But unfortunately, I had a divergence problem when running URANS ...

Hello Yvan,

Can you test it with these files?
At first, flow is solved and get average velocity field by URANS. flow_simple_test.zip
Second, the scalar transport is solved on the average velocity field by pseudo-RANS. scalar_simple_test.zip

As I said, in the example for scalar transport, all the ...

Hello all,

I'm sorry maybe this is a little bit stupid question.

Let's say, when there are three inlet faces of the same shape, and I give a volumic flow rate 13 (m^3/s) in GUI to all three inlet faces.

In this case, each face has 13 (m^3/s) volumic flow rate, right?
It does not mean the total ...

Hello Yvan,

I faced the same problem in the last post, and I noticed when it occurs.

Let's say when the flow simulation is run with Steady RANS to get the average flow field at first,
we have a problem if we use unsteady RANS or something different solver after restarting.
In that case, the flow ...

Hello Yvan,

For example, I tried the inlet condition with a negative velocity (handled by GUI) and set for scalar by this code:
call getfbr('extraction_duct', nlelt, lstelt)
do ilelt = 1, nlelt
ifac = lstelt(ilelt)
itypfb(ifac) = ientre

!Neumann B.C for scalar:
call field_get_id("scalar1", f_id ...

Hello all,

I am trying to make a outlet boundary conditions where:
- velocity has a negative volumic flow rate (m3/s)
- Neumann condition for scalar transport

Otherwise, I am also considering another idea instead of the above,
- inlet condition with a negative volumic flow rate (m3/s) (This is ...

Hello,

Actually, I did not solve this problem at that time, and I did not remember correctly how I solved this.
I guess I re-installed a few times. Then after that, I did not face this problem.

Sorry I cannot give you good answer, but anyway you should provide the info recommended in the ...

Hello Yvan,

Thank you, it works now.
cs_user_boundary_conditions-mapped_inlet.f90
!-------------------------------------------------------------------------------

! Code_Saturne version 6.0.5
! --------------------------
! This file is part of Code_Saturne, a general-purpose CFD tool ...

Hello Yvan,

Thank you for your reply and your notice,
but let me continue Fortran now. I will change it to C.

Here is a script. I am also thinking something is overwrapped.
cs_user_boundary_conditions-mapped_inlet.f90 ...