[steven_ang91]

Good day,

I am simulating charging/discharging of phase change material (solid-liquid PCM) using hot water that involves melting/solidification. The hot water flowing through copper tube, charging the PCM (sodium nitrate salt for example) with the help of metal fins contained in a tank. Inlet will be one end of copper tube and outlet (set as opening) on the other end of tube.

Solid domains:
Tube - copper (predefined material)
Fins - aluminium (predefined material)
Fluid domains*:
Heat transfer fluid - water (predefined material)
PCM - solid sodium nitrate & liquid sodium nitrate (manually added materials)

*For 2 different fluid domains only available if "Case Option>General>Enable Beta Features" is checked and "Constant Domain Physics" is unchecked.

The PCM salt is solid, but I need the phase change model so I created 2 materials for "Fluid and Particles Definition" in fluid domain so that the "Fluid Pair Models" tab appears. Saturation temperature was included.

Without error in CFX-pre, I proceed to CFX-Solver and I obtained out file with error as below:

================================================== ====================
OUTER LOOP ITERATION = 1 CPU SECONDS = 1.253E+01
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom-HTF | 0.00 | 4.4E-03 | 1.8E-01 | 2.6E-01 ok|
| V-Mom-HTF | 0.00 | 8.3E-05 | 5.3E-04 | 7.8E+00 ok|
| W-Mom-HTF | 0.00 | 8.1E-05 | 5.0E-04 | 5.7E+00 ok|
| P-Mass-HTF | 0.00 | 1.9E-03 | 1.1E-02 | 8.8 1.6E-02 OK|
+----------------------+------+---------+---------+------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTIO
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTION
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

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

I can't figure out what's the message that PEEKCS trying to say.
Remind me if I got any mistake, your help will much be appreciated.
Thanks in advance!

[Opaque]

Have you tried solving the simplified problem using only the phase change material fluid domain ?

You are not only solving a more complex problem, but also taking away the software safeguards by removing the "Constant Domain Physics" setting. Therefore, I would proceed with more care.

From the error message, I could say the software is looking for physics definition for a phase pair. In particular something related to the energy equation (heat transfer settings for the phase pair error ?) . Beyond that, you may have to contact ANSYS CFX support for further help.

[steven_ang91]

Dear Opaque,

Actually I wanted to try on solving only the phase change material fluid domain at the beginning. But in my case, phase change material just stay in the tank and doesn't flow in or out of the system during heat charging or discharging. That means it doesn't involve velocity for the PCM fluid domain. I guess CFX can't solve without anything flowing, can it?

[Opaque]

I will be hesitant to conclude what the software can do or not do w/o verification there is no user error, review the documentation, this forum and contacting ANSYS CFX support directly.

Regardless of the PCM flowing or not, you should be able to setup the case and the software compute a stationary solution since nothing is supposed to happen. The message you are getting is about a data structure error, not an modeling error.

[farah]

Hi, Did you managed to solve this issue? If yes, can you let me know how you did it? Cause, i do have same problem! Regards

Originally Posted by steven_ang91

Good day,

I am simulating charging/discharging of phase change material (solid-liquid PCM) using hot water that involves melting/solidification. The hot water flowing through copper tube, charging the PCM (sodium nitrate salt for example) with the help of metal fins contained in a tank. Inlet will be one end of copper tube and outlet (set as opening) on the other end of tube.

Solid domains:
Tube - copper (predefined material)
Fins - aluminium (predefined material)
Fluid domains*:
Heat transfer fluid - water (predefined material)
PCM - solid sodium nitrate & liquid sodium nitrate (manually added materials)

*For 2 different fluid domains only available if "Case Option>General>Enable Beta Features" is checked and "Constant Domain Physics" is unchecked.

The PCM salt is solid, but I need the phase change model so I created 2 materials for "Fluid and Particles Definition" in fluid domain so that the "Fluid Pair Models" tab appears. Saturation temperature was included.

Without error in CFX-pre, I proceed to CFX-Solver and I obtained out file with error as below:

================================================== ====================
OUTER LOOP ITERATION = 1 CPU SECONDS = 1.253E+01
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom-HTF | 0.00 | 4.4E-03 | 1.8E-01 | 2.6E-01 ok|
| V-Mom-HTF | 0.00 | 8.3E-05 | 5.3E-04 | 7.8E+00 ok|
| W-Mom-HTF | 0.00 | 8.1E-05 | 5.0E-04 | 5.7E+00 ok|
| P-Mass-HTF | 0.00 | 1.9E-03 | 1.1E-02 | 8.8 1.6E-02 OK|
+----------------------+------+---------+---------+------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTIO
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTION
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

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

I can't figure out what's the message that PEEKCS trying to say.
Remind me if I got any mistake, your help will much be appreciated.
Thanks in advance!

[yanglu]

Originally Posted by steven_ang91

Good day,

I am simulating charging/discharging of phase change material (solid-liquid PCM) using hot water that involves melting/solidification. The hot water flowing through copper tube, charging the PCM (sodium nitrate salt for example) with the help of metal fins contained in a tank. Inlet will be one end of copper tube and outlet (set as opening) on the other end of tube.

Solid domains:
Tube - copper (predefined material)
Fins - aluminium (predefined material)
Fluid domains*:
Heat transfer fluid - water (predefined material)
PCM - solid sodium nitrate & liquid sodium nitrate (manually added materials)

*For 2 different fluid domains only available if "Case Option>General>Enable Beta Features" is checked and "Constant Domain Physics" is unchecked.

The PCM salt is solid, but I need the phase change model so I created 2 materials for "Fluid and Particles Definition" in fluid domain so that the "Fluid Pair Models" tab appears. Saturation temperature was included.

Without error in CFX-pre, I proceed to CFX-Solver and I obtained out file with error as below:

================================================== ====================
OUTER LOOP ITERATION = 1 CPU SECONDS = 1.253E+01
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom-HTF | 0.00 | 4.4E-03 | 1.8E-01 | 2.6E-01 ok|
| V-Mom-HTF | 0.00 | 8.3E-05 | 5.3E-04 | 7.8E+00 ok|
| W-Mom-HTF | 0.00 | 8.1E-05 | 5.0E-04 | 5.7E+00 ok|
| P-Mass-HTF | 0.00 | 1.9E-03 | 1.1E-02 | 8.8 1.6E-02 OK|
+----------------------+------+---------+---------+------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTIO
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = /FLOW/GETVAR/PHYS_DIR/PP1 /ENERGY/ENERGY1/OPTION
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN2/VERTICES

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

I can't figure out what's the message that PEEKCS trying to say.
Remind me if I got any mistake, your help will much be appreciated.
Thanks in advance!

I am doing the simulation of twin screw compressors and have the same problem of 'Error detected by routine PEEKCS '. The error appears when I enable the non-overlap condition of the interfaces to the rotor domain.

How should I set up the non-overlap condition?

Thanks.

Domain Name : rotor
Mesh Coordinates

Details of error:-
----------------
Error detected by routine PEEKCS
CDANAM = HOW
CRESLT = NONE

Current Directory : /FLOW/BOUNDCON/ZN1/BCP2/NOVARIABLES/RGH