Modify existing velocity field

wzx1989221 · February 4, 2014, 15:49

Dear foamers,

Does anyone know that how I can add random number to an existing velocity filed?

I used funkySetFields to initialise a random velocity filed for my simulation, after it has run for some time, I want to restart the simulation by adding random number to the velocity field I've already got. Is there any way to achieve that?

Hope anyone can give me a hint. Thank you very much.

Best regards,
Tony

nimasam · February 5, 2014, 09:21

you can modify your solver in createFields, then after where it reads velocity you can add some thing like U=U + U*rand()

wzx1989221 · February 5, 2014, 10:48

Hi Nima,

Thanks for the reply. I just wonder if I modify the solver, would the velocity field always be like that? Since I just want to modify the existing field and put it to run again, do you have any ideas about that?

Thank you very much.

Regards,
Tony

nimasam · February 5, 2014, 10:50

if you change only creatFields.H, then it would be only in first iteration

February 4, 2014, 15:49	Modify existing velocity field	#1
wzx1989221 Member Tony Join Date: Nov 2013 Posts: 35 Rep Power: 13	Dear foamers, Does anyone know that how I can add random number to an existing velocity filed? I used funkySetFields to initialise a random velocity filed for my simulation, after it has run for some time, I want to restart the simulation by adding random number to the velocity field I've already got. Is there any way to achieve that? Hope anyone can give me a hint. Thank you very much. Best regards, Tony

February 5, 2014, 09:21		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	you can modify your solver in createFields, then after where it reads velocity you can add some thing like U=U + U*rand() __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

February 5, 2014, 10:50		#4
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	if you change only creatFields.H, then it would be only in first iteration __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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February 5, 2014, 10:48		#3
wzx1989221 Member Tony Join Date: Nov 2013 Posts: 35 Rep Power: 13	Hi Nima, Thanks for the reply. I just wonder if I modify the solver, would the velocity field always be like that? Since I just want to modify the existing field and put it to run again, do you have any ideas about that? Thank you very much. Regards, Tony