Free surface B.C. and I.C.

March 8, 2009, 16:10

Hello,

I would be glad if anyone could help me defining b.c. and i.c at a transient free surface air-water problem (flow in wavetank).

According to tutorial 7 I've understood how to define the volume fraction of air/water at the inlet and at the entire domain as I.C.

how can I define a velocity profile for the inlet (with CEL)?? is it possible to be funtion of time?

how can I define initial velocity field for entire domain?

Thanks!

John

March 9, 2009, 03:47

hey with MyVelocity*ctstep you can make it a function of time when MyVelocity is your expression for the profile.

neewbie

March 10, 2009, 16:28

can you please send me an example for the CEL function? purplehaze2020@gmail.com

March 11, 2009, 05:51

hi,

maybe this is better for you. http://www.cfd-online.com/Forum/cfx_....cgi/read/8958

once you have your "profile"... choose your function by which the profile should vary and simply replace the "t" in your time-function with "ctstep" add it as CEL. Et voilá.

neewbie

March 8, 2009, 16:10	Free surface B.C. and I.C.	#1
John N. Guest Posts: n/a	Hello, I would be glad if anyone could help me defining b.c. and i.c at a transient free surface air-water problem (flow in wavetank). According to tutorial 7 I've understood how to define the volume fraction of air/water at the inlet and at the entire domain as I.C. how can I define a velocity profile for the inlet (with CEL)?? is it possible to be funtion of time? how can I define initial velocity field for entire domain? Thanks! John

March 9, 2009, 03:47	Re: Free surface B.C. and I.C.	#2
neewbie Guest Posts: n/a	hey with MyVelocity*ctstep you can make it a function of time when MyVelocity is your expression for the profile. neewbie

March 10, 2009, 16:28	Re: Free surface B.C. and I.C.	#3
John N. Guest Posts: n/a	can you please send me an example for the CEL function? purplehaze2020@gmail.com

March 11, 2009, 05:51	Re: Free surface B.C. and I.C.	#4
neewbie Guest Posts: n/a	hi, maybe this is better for you. http://www.cfd-online.com/Forum/cfx_....cgi/read/8958 once you have your "profile"... choose your function by which the profile should vary and simply replace the "t" in your time-function with "ctstep" add it as CEL. Et voilá. neewbie

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