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-   -   CFX Solver : Sudden crash (http://www.cfd-online.com/Forums/cfx/25855-cfx-solver-sudden-crash.html)

Hervé May 23, 2008 08:14

CFX Solver : Sudden crash
 
Any idea why I get such a sudden crash ? What could be the reasons ? Can a bad grid give such a result ?

Best regards,

Hervé

******************

******************

================================================== ==========

OUTER LOOP ITERATION = 51 CPU SECONDS = 6.837E+03

-----------------------------------------------------------

| Equation | Rate | RMS Res | Max Res | Linear Solution |

+------------+------+---------+---------+--------

| U-Mom | 0.99 | 4.9E-03 | 1.0E-01 | 9.3E-04 OK|

| V-Mom | 0.99 | 4.9E-03 | 1.0E-01 | 9.1E-04 OK|

| W-Mom | 1.01 | 4.9E-03 | 8.8E-02 | 3.2E-03 OK|

| P-Mass | 0.96 | 2.4E-05 | 2.8E-03 | 21.3 1.3E-01 ok|

+------------+------+---------+---------+-----------------+

| K-TurbKE | 1.09 | 5.4E-03 | 1.7E-01 | 6.2 6.0E-04 OK|

| E-Diss.K | 1.00 | 9.3E-04 | 4.0E-02 | 9.1 5.1E-05 OK|

+-------------+------+---------+---------+---------------+

================================================== ==========

OUTER LOOP ITERATION = 52 CPU SECONDS = 6.971E+03

-----------------------------------------------------------

| Equation | Rate | RMS Res | Max Res | Linear Solution |

+------------+------+---------+---------+-----------------+

| U-Mom | 0.00 | 1.1E-07 | 2.6E-06 | 6.7E+09 F |

| V-Mom | 0.00 | 1.1E-07 | 2.6E-06 | 5.8E+09 F |

| W-Mom | 0.00 | 1.2E-07 | 2.2E-06 | 8.6E+11 * |

| P-Mass | 0.00 | 1.1E-14 | 5.5E-13 | 11.2 3.4E+11 * |

+------------+------+---------+---------+-----------------+

+---------------------------------------------------------+

| ****** Notice ****** |

| A wall has been placed at portion(s) of an INLET The boundary condition (at 40.3% of the faces, 44.4% of the area)to prevent fluid from flowing out of the domain.

| The boundary condition name is: A In Inlet.

| The fluid name is: Water. |

| If this situation persists, consider switching to an Opening type boundary condition instead.

| +---------------------------------------------------------+

+---------------------------------------------------------+

| ****** Notice ****** |

| A wall has been placed at portion(s) of an OUTLET |

| boundary condition (at 45.5% of the faces, 45.6% of the area) to prevent fluid from flowing into the domain. The boundary condition name is: F Out Outlet.

The fluid name is: Water.

If this situation persists, consider switching to an Opening type boundary condition instead.

+---------------------------------------------------------+

+--------------------------------------------------------------------+

| ERROR #001100279 has occurred in subroutine ErrAction.

Message: c_fpx_handler: Floating point exception: Overflow


Rogerio Fernandes Brito May 23, 2008 11:13

Re: CFX Solver : Sudden crash
 
decrease the lenght of your mesh decrease the timestep change the turbulency model

ahmed salem June 16, 2008 06:40

how can i solve it
 
OUTER LOOP ITERATION = 11 CPU SECONDS = 5.120E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.68 | 2.2E-04 | 7.1E-03 | 5.7E-02 OK| | V-Mom | 0.74 | 3.3E-04 | 8.6E-03 | 3.7E-02 OK| | W-Mom | 0.68 | 2.3E-04 | 8.4E-03 | 5.5E-02 OK| | P-Mass | 0.81 | 1.6E-04 | 1.5E-02 | 8.5 6.1E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 45.1% of the faces, 47.1% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 0.45 | 8.6E-04 | 2.3E-02 | 5.2 1.0E-01 OK| | E-Diss.K | 0.40 | 8.4E-03 | 3.3E-01 | 12.0 3.0E-03 OK| +----------------------+------+---------+---------+------------------+

================================================== ==================== OUTER LOOP ITERATION = 12 CPU SECONDS = 5.600E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.75 | 1.7E-04 | 4.8E-03 | 5.0E-02 OK| | V-Mom | 0.64 | 2.1E-04 | 7.3E-03 | 3.8E-02 OK| | W-Mom | 0.74 | 1.7E-04 | 4.7E-03 | 4.8E-02 OK| | P-Mass | 0.94 | 1.5E-04 | 1.4E-02 | 8.5 7.5E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 33.0% of the faces, 34.4% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 1.07 | 9.2E-04 | 2.1E-02 | 9.4 2.2E-02 OK| | E-Diss.K | 0.94 | 7.8E-03 | 2.1E-01 | 12.0 1.8E-03 OK| +----------------------+------+---------+---------+------------------+

================================================== ==================== OUTER LOOP ITERATION = 13 CPU SECONDS = 6.090E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.91 | 1.5E-04 | 3.4E-03 | 5.9E-02 OK| | V-Mom | 0.83 | 1.8E-04 | 5.9E-03 | 4.0E-02 OK| | W-Mom | 0.90 | 1.5E-04 | 3.2E-03 | 5.9E-02 OK| | P-Mass | 0.71 | 1.1E-04 | 1.4E-02 | 8.5 7.6E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 23.6% of the faces, 24.4% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 1.09 | 1.0E-03 | 1.7E-02 | 9.4 2.0E-02 OK| | E-Diss.K | 1.43 | 1.1E-02 | 3.5E-01 | 12.0 1.9E-03 OK| +----------------------+------+---------+---------+------------------+

================================================== ==================== OUTER LOOP ITERATION = 14 CPU SECONDS = 6.578E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.84 | 1.3E-04 | 2.6E-03 | 6.1E-02 OK| | V-Mom | 0.92 | 1.6E-04 | 6.1E-03 | 3.4E-02 OK| | W-Mom | 0.84 | 1.3E-04 | 2.8E-03 | 6.1E-02 OK| | P-Mass | 0.85 | 9.2E-05 | 1.5E-02 | 8.5 6.9E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 16.8% of the faces, 17.6% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 0.98 | 9.8E-04 | 2.5E-02 | 5.2 7.1E-02 OK| | E-Diss.K | 0.69 | 7.8E-03 | 2.6E-01 | 12.0 2.4E-03 OK| +----------------------+------+---------+---------+------------------+

================================================== ==================== OUTER LOOP ITERATION = 15 CPU SECONDS = 7.058E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.83 | 1.1E-04 | 3.4E-03 | 4.9E-02 OK| | V-Mom | 0.90 | 1.5E-04 | 6.6E-03 | 2.6E-02 OK| | W-Mom | 0.84 | 1.1E-04 | 3.4E-03 | 4.9E-02 OK| | P-Mass | 1.08 | 9.9E-05 | 1.7E-02 | 8.5 7.5E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 12.4% of the faces, 12.7% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 0.95 | 9.3E-04 | 3.7E-02 | 5.2 4.0E-02 OK| | E-Diss.K | 0.62 | 4.8E-03 | 1.9E-01 | 12.0 2.8E-03 OK| +----------------------+------+---------+---------+------------------+

================================================== ==================== | Timescale Information | ---------------------------------------------------------------------- | Equation | Type | Timescale | +----------------------+------------------------+--------------------+ | U-Mom | Auto Timescale | 1.98430E+00 | | V-Mom | Auto Timescale | 1.98430E+00 | | W-Mom | Auto Timescale | 1.98430E+00 | +----------------------+------------------------+--------------------+ | K-TurbKE | Auto Timescale | 1.98430E+00 | | E-Diss.K | Auto Timescale | 1.98430E+00 | +----------------------+------------------------+--------------------+

================================================== ==================== OUTER LOOP ITERATION = 16 CPU SECONDS = 7.538E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.85 | 9.0E-05 | 4.2E-03 | 3.4E-02 OK| | V-Mom | 0.85 | 1.3E-04 | 6.9E-03 | 2.0E-02 OK| | W-Mom | 0.85 | 9.2E-05 | 4.6E-03 | 3.4E-02 OK| | P-Mass | 1.12 | 1.1E-04 | 2.0E-02 | 8.5 7.8E-02 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 10.9% of the faces, 11.1% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlets. | | The fluid name is: Water. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ | K-TurbKE | 0.91 | 8.5E-04 | 5.0E-02 | 5.2 2.9E-02 OK| | E-Diss.K | 0.54 | 2.6E-03 | 1.1E-01 | 12.0 2.5E-03 OK| +----------------------+------+---------+---------+------------------+


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