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Old   May 2, 2014, 10:13
Default CHT Oil heat exchanger problem
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Jakub
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Hello there

In a first place, I must say that I'm quite new to CFD analysis, but I've read and done appropriate tutorials about CHT analysis.

My model is steel coil in which flow thermal oil. These heat exchanger is located in exterior similar to this shown in picture below.
Input/Output data is in .txt file in attachment.

Problem is that solver won't run, showing the comment:

Return value C0000005 >FFFF in parse_rv, treating as not-run.
I've tried doing it from the beginning, correcting and simplifying model but the error stays the same.

I suspect these two highlighted 2d regions fayed to inlet and outlet 2d regions, but I hadn't that error in exact situation in different model.

I would very appreciate any help.

output.txt

nc.jpg
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Old   May 2, 2014, 13:25
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I've changed solid domain between oil and fumes into thin surface interface model. Apparently, there is an solver error too:

Quote:
+--------------------------------------------------------------------+
| Convergence History |
+--------------------------------------------------------------------+

================================================== ====================
| Timescale Information |
----------------------------------------------------------------------
| Equation | Type | Timescale |
+----------------------+------------------------+--------------------+
| U-Mom-Fumes | Auto Timescale | 2.98064E-02 |
| V-Mom-Fumes | Auto Timescale | 2.98064E-02 |
| W-Mom-Fumes | Auto Timescale | 2.98064E-02 |
| P-Mass-Fumes | Auto Timescale | 2.98064E-02 |
+----------------------+------------------------+--------------------+
| U-Mom-Oil | Auto Timescale | 2.98064E-02 |
| V-Mom-Oil | Auto Timescale | 2.98064E-02 |
| W-Mom-Oil | Auto Timescale | 2.98064E-02 |
| P-Mass-Oil | Auto Timescale | 2.98064E-02 |
+----------------------+------------------------+--------------------+
| H-Energy-Fumes | Auto Timescale | 2.98064E-02 |
| H-Energy-Oil | Auto Timescale | 2.98064E-02 |
+----------------------+------------------------+--------------------+
| K-TurbKE-Fumes | Auto Timescale | 2.98064E-02 |
| E-Diss.K-Fumes | Auto Timescale | 2.98064E-02 |
+----------------------+------------------------+--------------------+
| K-TurbKE-Oil | Auto Timescale | 2.98064E-02 |
| E-Diss.K-Oil | Auto Timescale | 2.98064E-02 |
+----------------------+------------------------+--------------------+

================================================== ====================
OUTER LOOP ITERATION = 35 ( 1) CPU SECONDS = 4.353E+04 (1.220E+02)
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom-Fumes | 3.81 | 1.3E-03 | 3.2E-01 | 2.5E-02 OK|
| V-Mom-Fumes | 2.16 | 1.8E-03 | 3.2E-01 | 2.3E-02 OK|
| W-Mom-Fumes | 1.85 | 1.0E-03 | 6.5E-02 | 4.2E-02 OK|
| P-Mass-Fumes |47.19 | 1.1E-02 | 1.9E+00 | 8.8 4.2E-02 OK|
+----------------------+------+---------+---------+------------------+
| U-Mom-Oil | 0.00 | 3.0E-04 | 4.1E-02 | 8.5E-02 OK|
| V-Mom-Oil | 0.00 | 3.3E-04 | 4.2E-02 | 6.8E-02 OK|
| W-Mom-Oil | 0.00 | 1.4E-03 | 1.5E-01 | 9.7E-02 OK|
| P-Mass-Oil | 0.00 | 3.3E-03 | 3.7E-01 | 8.7 4.6E-02 OK|
+----------------------+------+---------+---------+------------------+
----------------------------------
Error in subroutine FNDVAR :
Error finding variable TEMP
GETVAR originally called by subroutine UPDATE_CSVAR


+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine GV_ERROR
|
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.
Anyone could show me the way to overcome this?

Thanks
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Old   May 2, 2014, 19:03
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Problem solved
---------------
EDIT:
Apparently, it's not. I mean, sometimes it appears sometimes not. Could it have something in common with static/total temperature? On inlet boundaries I use cartesian velocities.

Last edited by kubawin; May 3, 2014 at 14:29.
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