[CFXer]

Hello!

The solver stopped my simulations after only 3 timesteps given the following error message:

Slave: 10
Slave: 10 +--------------------------------------------------------------------+
Slave: 10 | PROBLEM ENCOUNTERED WHEN EXECUTING CFX EXPRESSION LANGUAGE |
Slave: 10 | |
Slave: 10 | The CFX expression language was evaluating: |
Slave: 10 | Resistance Loss Coefficient |
Slave: 10 | |
Slave: 10 | The problem was: |
Slave: 10 | LOGe-OF-NON-POSITIVE |
Slave: 10 | |
Slave: 10 | FURTHER INFORMATION |
Slave: 10 | |
Slave: 10 | The problem was encountered in executing the expression for: |
Slave: 10 | $SCALAR_0 |
Slave: 10 | The complete expression is: |
Slave: 10 | (0.79*ln(Re)-1.64)^(-2)/0.733[mm] |
Slave: 10 | The error occurs on sub-expression: |
Slave: 10 | ln(Re) |
Slave: 10 | |
Slave: 10 | BACKGROUND INFORMATION |
Slave: 10 | |
Slave: 10 | The error was detected at one location. The same problem may be |
Slave: 10 | present at other locations - that has not been investigated. |
Slave: 10 | The following values are for the first location which has the |
Slave: 10 | problem. |
Slave: 10 | |
Slave: 10 | In this expression, these sub-expressions have been calculated: |
Slave: 10 | |
Slave: 10 | Sub-expression = Value |
Slave: 10 | |
Slave: 10 | 0.79 = 0.790000 |
Slave: 10 | These values were set before reaching the current expression: |
Slave: 10 | |
Slave: 10 | Name = Expression = Value |
Slave: 10 | |
Slave: 10 | Re = density*(-w)*0.733[mm]/visc= -855.198 |
Slave: 10 | w = 0.154518 |
Slave: 10 | viscosity = 1.953092E-05 |
Slave: 10 | density = 147.471 |
Slave: 10 | |
Slave: 10 | END OF DIAGNOSTIC OUTPUT FOR CFX EXPRESSION LANGUAGE |
Slave: 10 +--------------------------------------------------------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 4
Slave routine : ErrAction
Master location : Message Handler
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Failed to calculate sources in GETSOU for LOSS_F2 from directory |
| "LOSSM/RESIST" on location "6!�� |
| |
| |
| |
| |
+--------------------------------------------------------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 4
Slave routine : ErrAction
Master location : Message Handler
Message label : 001100279
Message follows below - :

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

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine MESG_RETRIEVE. |
| Message: |
| Stopping the run due to error(s) reported above |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+


I have searched about the GEUSOU error, but nothing has come out.

Does anyone know what this error message means?

Thank you in advance.

[karachun]

Originally Posted by CFXer

Does anyone know what this error message means?

Error is obvious. You have this set of expressions.

Re = density*(-w)*0.733[mm]/visc= -855.198
w = 0.154518
viscosity = 1.953092E-05
density = 147.471

Then you try to get natural logarithm from negative value - Re = -855.198.

(0.79*ln(Re)-1.64)^(-2)/0.733[mm]


You can not take logarithms of negative value (actually you can, you get complex numbers with imaginary parts but CFX can not handle imaginary parts and you don't want to work with complex numbers).

[CFXer]

Originally Posted by karachun

Error is obvious. You have this set of expressions.

Re = density*(-w)*0.733[mm]/visc= -855.198
w = 0.154518
viscosity = 1.953092E-05
density = 147.471

Then you try to get natural logarithm from negative value - Re = -855.198.

(0.79*ln(Re)-1.64)^(-2)/0.733[mm]


You can not take logarithms of negative value (actually you can, you get complex numbers with imaginary parts but CFX can not handle imaginary parts and you don't want to work with complex numbers).

Thank you! I have solved the problem with your reply!