Learning Forum

[Leonardo Geronzi]

Hi,

I am executing some simulations with a parametric mesh in Fluent (running in parallel).

For every mesh, I would like to export the pressure at the wall or the wall shear stress for example.

In the journal, I'm using /file/export ascii wss (2 3 4 5 6 7 8 9 10) yes wall-shear () no 

where from (2.... to 10) are the surfaces of the mesh. It works but nodes are always numbered from 1 to n and there is no nodal correspondence (probably due to the parallel partition?). It means that in row 1 sometimes I have node 2034, sometimes node 6885, sometimes node 99999 ecc.
I need to create a list where on row x there are always results associated with the same node id even if its position has changed in space due to the modified parametric mesh.
How can I do? Is it possible to export Node Id in Fluent?

P.S. I know that CFD post is a solution but I need to do it directly in Fluent.

Thank you.

[Rob]

Fluent is an unstructured solver, and the node IDs aren't necessarily static definitions: it's why it's always a good idea to write case and data on finishing a run.  

What exactly are you trying to figure out? 

[Leonardo Geronzi]

 

Ok, it’s a pity. I need to create a ROM (without using the RBP extension).
At this point, CFD post is the only possibility. I put here the solution I will use in CFD-Post if any user will be interested in future. I stored the solution for every parametric mesh in a new cas and dat file.
I used a loop in CFD-Post where n is the number of simulations.

COMMAND FILE:

CFX Post Version = 23.1

END

 

DATA READER:

Clear All Objects = false

Append Results = true

Edit Case Names = false

Multi Configuration File Load Option = Last Case

Open in New View = true

Keep Camera Position = true

Load Particle Tracks = true

Multi Configuration File Load Option = Last Case

Construct Variables From Fourier Coefficients = true

Open to Compare = false

Files to Compare =

END

 

 

 

 

 

!$i = 1;

!while ($i < n){

!if($i<2){

DATA READER:

Run Selection = “Simulation/Run/cff-restart-dat”

END

 

>load filename=D:/Leonardo/ROM_DT/ROM_SSM_files/dp0/FLU-1/Fluent/SSM-$i.cas.h5, force_reload=true

!}

!else {

DATA READER:

Domains to Load=

END

> load filename=D:/Leonardo/ROM_DT/ROM_SSM_files/dp0/FLU-1/Fluent/SSM-$i.cas.h5, \

case=Case SSM 1.cas, force_reload=true

!}

 

EXPORT:

ANSYS Export Data = Element Heat Flux

ANSYS File Format = ANSYS

ANSYS Reference Temperature = 0.0 [K]

ANSYS Specify Reference Temperature = Off

ANSYS Supplemental HTC = 0.0 [W m^-2 K^-1]

Additional Variable List =

BC Profile Type = Inlet Velocity

CSV Type = CSV

Case Name = Case SSM 1.cas

Export Connectivity = Off

Export Coord Frame = Global

Export File = D:/Leonardo/ROM_DT/ROM_SSM_files/user_files/wss-$i.csv

Export Geometry = On

Export Location Aliases =

Export Node Numbers = On

Export Null Data = On

Export Type = Generic

Export Units System = Current

Export Variable Type = Current

External Export Data = None

Include File Information = Off

Include Header = On

Location = arch

Location List = arch,ascending_aorta,bc,descending_aorta,end_ascending_aorta,\

high_valsalva_sinuses,lcc,low_valsalva_sinuses,ls

Null Token = null

Overwrite = On

Precision = 8

Separator = “, “

Spatial Variables = X,Y,Z

Variable List = Wall Shear

Vector Brackets = ()

Vector Display = Scalar

END

 

 

>export

 

!$i ++;

!}