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Old   September 10, 2013, 00:48
Exclamation does cfx can simulate the phase change process
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wenjing Han
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hi alls ,does anybody know wheater can cfx simulate the phase change process of unsaturated water heated to overheat ? thaks so much!
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Old   September 10, 2013, 05:48
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Yes, it can.
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Old   September 10, 2013, 09:30
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As we discussed in your other thread, models exist for phase change such as the RPI wall boiling model, which models phase change near walls. You can even do solidification if you really want that!

However you really need to read about the models and try to understand them before even thinking about doing a phase change simulation.

Phase change is not easy, and may involve unrealistic time scales. A colleague of mine talked about a time step of 1e-6 seconds, in transient mode to model flash evaporation!
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Old   September 10, 2013, 10:25
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Originally Posted by RicochetJ View Post
As we discussed in your other thread, models exist for phase change such as the RPI wall boiling model, which models phase change near walls. You can even do solidification if you really want that!

However you really need to read about the models and try to understand them before even thinking about doing a phase change simulation.

Phase change is not easy, and may involve unrealistic time scales. A colleague of mine talked about a time step of 1e-6 seconds, in transient mode to model flash evaporation!
yes,it is very difficult, but as you said ,the RPI models can not simulate transition from nuclear boiling to film boiling,this problem can not depend on RPI models, it was disturbed me ever before,and i really desire to someone who can tell me how should i do,i needn't know the detail,but the way i shall go,like" should i need construct the conservation equation of film boiling ,and Compile a program about film boiling to import to cfx to simulate this phase change process?"
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Old   September 10, 2013, 10:31
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Yes, it can.
thanks for your reply,now the trouble is i can't simulate phase transition from Nucleate boiling to film boiling,you know ,cfx can only simulate Nucleate boiling,how should i make the film boiling simulation success?can you give me some advises ? thanks a lot
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Old   September 10, 2013, 10:59
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yes,it is very difficult, but as you said ,the RPI models can not simulate transition from nuclear boiling to film boiling,this problem can not depend on RPI models, it was disturbed me ever before,and i really desire to someone who can tell me how should i do,i needn't know the detail,but the way i shall go,like" should i need construct the conservation equation of film boiling ,and Compile a program about film boiling to import to cfx to simulate this phase change process?"
Have you heard of Ansys Customer Portal? My best advice to you is use the Customer Portal (https://support.ansys.com/portal/sit...CustomerPortal) and ask Ansys themselves. They know their own software better than anyone else, and will be able to advise you.
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Old   September 11, 2013, 01:17
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Have you heard of Ansys Customer Portal? My best advice to you is use the Customer Portal (https://support.ansys.com/portal/sit...CustomerPortal) and ask Ansys themselves. They know their own software better than anyone else, and will be able to advise you.
ah..i haven't register ever before...and i don't have the customer number
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Old   September 11, 2013, 04:45
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ah..i haven't register ever before...and i don't have the customer number
You'll find the customer number at (assuming Windows):
Start/Ansys/Ansys Client licensing /Client Anslic_Admin utility
then
View Status Diagnostic Options/Display the customer number
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Old   September 11, 2013, 11:18
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You'll find the customer number at (assuming Windows):
Start/Ansys/Ansys Client licensing /Client Anslic_Admin utility
then
View Status Diagnostic Options/Display the customer number
thanks a lot
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