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-   -   Problem in Solving tutorial no. 25 of CFX(ANSYS 14). (http://www.cfd-online.com/Forums/cfx/99848-problem-solving-tutorial-no-25-cfx-ansys-14-a.html)

jacob.debbarma April 13, 2012 05:13

Problem in Solving tutorial no. 25 of CFX(ANSYS 14).
 
Hello I'm very new to Ansys 14 software, while dealing with turbo-machinery in solving the CFX tutorial no-25( centrifugal compressor aerodynamic and structural analysis)

I used
Angular Velocity:- 5000 RPM
Mass flow rate: - 0.53 kg.S^-1
Physical TimeScale:- 0.0002 S.

the CFX solver always returned------------

OUTER LOOP ITERATION = 132 ( 32) CPU SECONDS = 2.936E+03 (8.426E+02)
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 0.99 | 3.8E-04 | 4.7E-03 | 5.4E-04 OK|
| V-Mom | 0.98 | 5.1E-04 | 5.3E-03 | 4.2E-04 OK|
| W-Mom | 0.99 | 2.6E-04 | 5.6E-03 | 6.1E-03 OK|
| P-Mass | 0.92 | 1.3E-01 | 1.2E+01 | 5.3 2.7E-05 OK|
+----------------------+------+---------+---------+------------------+
| H-Energy | 0.99 | 1.2E-03 | 1.9E-02 | 5.3E-04 OK|
| T-Energy | 1.01 | 3.6E-05 | 1.3E-04 | 5.9 5.3E-04 OK|
+----------------------+------+---------+---------+------------------+
| K-TurbKE | 0.98 | 3.7E-04 | 5.9E-03 | 5.8 1.8E-04 OK|
| E-Diss.K | 1.00 | 5.1E-04 | 2.6E-02 | 8.4 6.3E-05 OK|
+----------------------+------+---------+---------+------------------+
+--------------------------------------------------------------------+
| Notice: The maximum Mach number is 1.090E+03. |
+--------------------------------------------------------------------+

================================================== ====================
OUTER LOOP ITERATION = 133 ( 33) CPU SECONDS = 2.964E+03 (8.702E+02)
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 0.99 | 3.8E-04 | 5.0E-03 | 5.3E-04 OK|
| V-Mom | 0.98 | 5.0E-04 | 5.2E-03 | 4.2E-04 OK|
| W-Mom | 0.99 | 2.6E-04 | 5.5E-03 | 6.1E-03 OK|
| P-Mass | 1.07 | 1.4E-01 | 1.2E+01 | 5.3 2.7E-05 OK|
+----------------------+------+---------+---------+------------------+
| H-Energy | 0.99 | 1.2E-03 | 1.8E-02 | 5.5E-04 OK|
| T-Energy | 1.01 | 3.6E-05 | 1.3E-04 | 5.9 5.5E-04 OK|
+----------------------+------+---------+---------+------------------+
| K-TurbKE | 0.99 | 3.7E-04 | 5.9E-03 | 5.8 1.7E-04 OK|
| E-Diss.K | 1.01 | 5.2E-04 | 2.9E-02 | 8.4 6.4E-05 OK|
+----------------------+------+---------+---------+------------------+
+--------------------------------------------------------------------+
| Notice: The maximum Mach number is 1.144E+03. |
+--------------------------------------------------------------------+

================================================== ====================
OUTER LOOP ITERATION = 134 ( 34) CPU SECONDS = 2.989E+03 (8.952E+02)
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

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

+--------------------------------------------------------------------+
| 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.

+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| C:/Users/JACOB/Documents/11_04_2012_tutorial_compressor_with_user- |
| _design_data_2nd_TRY/13_04_2012_tutorial_compressor_with_user_des- |
| ign_data_pending_tasks/dp0_CFX_Solution/CFX_007: |
| |
| mon

...........................................

ghorrocks April 15, 2012 17:59

Your simulation has diverged, Do a search on the forum for "floating point error" for tips.


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