Is it possible to set equations on/off with UDF while solving?

schwaral · November 11, 2020, 10:05

Hi all,

I would like to solve a problem of two UDS uncoupled since due to coupling the solving time is way too long. Is there a possibility to solve UDS1 for one timestep and then turn of UDS1 and solve for the 2nd timestep UDS2 by using a define adjust UDF?

Or is the only way to use a journal file and set simulation time equal one timestep and change the equations after the whole simulation is finished after one timestep? It would be nice to have a way to set the simulation time larger then one timestep.

Alex

AlexanderZ · November 12, 2020, 03:59

you need journal file for that

run 1 time step simulation several times, to make it longer
you may use scheme language inside journals

schwaral · November 12, 2020, 05:34

thanks a lot!

Yep I sorted it out like that. You helped me quite a lot in my thesis! Could you maybe help me with this problem in the forum for one last time? It is the last step before my setup is finished. Ansys support does not want to help regarding their UDFs :/ Why leads UDS_FLUX Example from User Guide to wrong results?

November 11, 2020, 10:05	Is it possible to set equations on/off with UDF while solving?	#1
schwaral Member Deutschland Join Date: Jun 2020 Location: https://t.me/pump_upp Posts: 43 Rep Power: 5	Hi all, I would like to solve a problem of two UDS uncoupled since due to coupling the solving time is way too long. Is there a possibility to solve UDS1 for one timestep and then turn of UDS1 and solve for the 2nd timestep UDS2 by using a define adjust UDF? Or is the only way to use a journal file and set simulation time equal one timestep and change the equations after the whole simulation is finished after one timestep? It would be nice to have a way to set the simulation time larger then one timestep. Alex

November 12, 2020, 03:59		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	you need journal file for that run 1 time step simulation several times, to make it longer you may use scheme language inside journals __________________ best regards ****************************** press LIKE if this message was helpful

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November 12, 2020, 05:34		#3
schwaral Member Deutschland Join Date: Jun 2020 Location: https://t.me/pump_upp Posts: 43 Rep Power: 5	thanks a lot! Yep I sorted it out like that. You helped me quite a lot in my thesis! Could you maybe help me with this problem in the forum for one last time? It is the last step before my setup is finished. Ansys support does not want to help regarding their UDFs :/ Why leads UDS_FLUX Example from User Guide to wrong results?