[domanjae]

hi, I'm totally new in CFX field and I want to use this software to figure out the velocity, wall shear, pressure of the blood in blood vessel through FSI(transient structural & CFX). there is no single warning before I got to the stage of cfx solver, but in solving it an error appears.

+--------------------------------------------------------------------+
| Convergence History |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Writing transient file 0.trn |
| Name : Transient Results 1 |
| Type : Selected Variables |
| Option : Every Timestep |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #002100061 has occurred in subroutine SERVE_CLIENTS. |
| Message: |
| The connection between this CFX process and an external process |
| has died unexpectedly. The following error was received: |
| External process : ANSYS |
| Error experienced : Read |
| |
| ** This error is fatal: Terminating ANSYS CFX Solver execution ** |
| Please review the output, error and log files from both the CFX |
| and external processes to determine the cause of the error. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+
could any one kindly give me advise about solving error?

I gave condition of fixed support to vessel and gave fluid solid interface to side of vessel.
also, I gave pulsative pressure input to inlet

[ghorrocks]

If you are new to CFD then I would not start with an FSI case. You need to be comfortable with CFD only simulations before you can couple it with FEA with any chance of success. Have you done the tutorial examples provided with CFX?

[domanjae]

Originally Posted by ghorrocks

If you are new to CFD then I would not start with an FSI case. You need to be comfortable with CFD only simulations before you can couple it with FEA with any chance of success. Have you done the tutorial examples provided with CFX?

Thank you for your advise ghorrocks!

I have a exactly same example. (about the blood vessel.) I just thought that if I only change the geometry with the same settings, I could solve it. But it seems there's a problem

The geometry used in example was a tube looks like 'Y' already filled inside. (x_t file)

The geometry which I'm about to use is a single tube with a block in the middle.(wanted to figure out the wall shear if there is a block in the middle of vessel.)
I used CATIA V5 to draw it(igs file), and inside the tube is hollow. So that I had to use tool "FILL" to fill inside with liquid.


I'm confused whether it's having problems from mesh or from the "FIIL" or file type. Or other reasons?

Is it impossible to get outcomes by just changing the geometry? Or could you give me some more specific explanations?