Saving velocity field and reading it back for another case

pranab_jha · June 10, 2011, 01:43

I want to capture the velocity field in single phase flow for a domain and then use it for initializing my multiphase flow in the same domain. How can this be achieved? Is there a way to capture the vectors (or velocity data in any form) and write some type of data file that can be read back when I start my multiphase solver?

I found this thread, but no-one seemed to have an answer then? Can anyone help me now?
http://www.cfd-online.com/Forums/flu...hase-flow.html

Thanks,
Pranab

pranab_jha · June 13, 2011, 10:42

This question was asked by another gentleman a few years back too, but seems no-one had an answer. Well, I asked one of my colleagues in the lab here, and he had a very good suggestion to make.

To get the velocity/pressure data at every node from a steady state or a single phase case, write it as an "Interpolation file" with the extension [.ip] once you have your solution. Then you can read this .ip file back into your two-phase flow field after you initialize your flow field, so that now you have initialized the domain with a velocity field from the steady state itself. This will give better and quicker convergence in unsteady case.

Hope this is of help to someone.
Cheers!

YAKUB A · September 1, 2023, 02:44

its was helpful even none answered, you given the solution.thanks

June 10, 2011, 01:43	Saving velocity field and reading it back for another case	#1
pranab_jha Member Pranab N Jha Join Date: Nov 2009 Location: Houston, TX Posts: 86 Rep Power: 17	I want to capture the velocity field in single phase flow for a domain and then use it for initializing my multiphase flow in the same domain. How can this be achieved? Is there a way to capture the vectors (or velocity data in any form) and write some type of data file that can be read back when I start my multiphase solver? I found this thread, but no-one seemed to have an answer then? Can anyone help me now? http://www.cfd-online.com/Forums/flu...hase-flow.html Thanks, Pranab YAKUB A and Nat.7777 like this.

June 13, 2011, 10:42		#2
pranab_jha Member Pranab N Jha Join Date: Nov 2009 Location: Houston, TX Posts: 86 Rep Power: 17	This question was asked by another gentleman a few years back too, but seems no-one had an answer. Well, I asked one of my colleagues in the lab here, and he had a very good suggestion to make. To get the velocity/pressure data at every node from a steady state or a single phase case, write it as an "Interpolation file" with the extension [.ip] once you have your solution. Then you can read this .ip file back into your two-phase flow field after you initialize your flow field, so that now you have initialized the domain with a velocity field from the steady state itself. This will give better and quicker convergence in unsteady case. Hope this is of help to someone. Cheers! Masoud.a, soheil_r7, rajann_786 and 7 others like this.

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September 1, 2023, 02:44		#3
YAKUB A New Member Yakub Join Date: Apr 2023 Posts: 8 Rep Power: 3	its was helpful even none answered, you given the solution.thanks