Hi everybody
I'm working with a reactive distillation column in ASPEN V8.8, the kinetic model is written in a fortran subroutine. However, when the pressure driven model initializes in aspen dynamic, an error appears as following:
ERROR:
ERROR:
2. A sub-group in the decomposition failed to solve
Finally
3. An exception (code 0xc0000005 - access violation) occurred in user procedure pRDKUsr, loaded from C:\Program Files (x86)\AspenTech\AMSystem V8.8\Bin\Dynamics.dll
I've just tried to change the pressure drop, and analyzed all the flowsheets, including the pressure changers, and the numerical convergence. I will be so thankful if someone help Me.
I usually approach this type of problem by turning off the part of the simulation that is crashing and gradually make small changes, In this case I would change the kinetic model to completely turn off the reaction, If the column converges change it by making a very small (1%) conversion and if it keeps working march it up to the desired amount of reaction.
II is possible the Fortran program s not working at all you may need to move it out of your simulation to add or debug code to make it more bullet proof or simply make sure the variables are not getting mixed up when you pass them from the Fortran to the Simulation environment.
Best to step through the code and display the intermediate results as a way to discover where the failure occurred and which variables were responsible.
Sometimes a dynamical error occurs during link when one of the module names is misspelled. Other dynamic errors occur when allocating memory for the subroutine if nested loops have no logical end condition.
Always best to track the error systematically, because there is always some new surprise. Other example is using in code a name that Fortran or ASPEN reserves for something else.
have you able to solve your problem? I am also facing the same problem
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