Making Wave in free surface flow

omidiut · August 13, 2011, 01:46

Hi all
I am trying to simulate a ship on free surface flow with sinusoidal wave that's made by wave maker. How can i simulate this sinusoidal wave as a boundary condition for investigate the motion of ship?

Thanks
Best regards.

ghorrocks · August 13, 2011, 08:18

There are some posts on this forum about setting ocean wave boundary conditions. Do a search for them on the forum.

mauricio · August 14, 2011, 16:50

hmm well the closest i've done is a sinusoidal BC for a multiphase slug simulation... What i did is to calculate the height of the water with the sinosoidal CEL expression; then at the inlet BC i set the volume fractions of water and air to depend on an "if" cel expression; if y > (calculated height) , 1,0. that should set the air fraction to 1 if it's over your calculated height, and after yo set the water volume fraction to a similar expression you should get that sinusoidal BC.
As glenn said tho I'd check all the posts in the forum anyway to see if there's something more applied to your case.

omidiut · August 18, 2011, 04:07

Thanks mauricio.
I'd check all the posts in the forum about this, but i didn't find any useful things.

Best regards

ghorrocks · August 18, 2011, 07:47

Try:
en.wikipedia.org/wiki/Airy_wave_theory

and
folk.ntnu.no/oivarn/hercules_ntnu/.../lwt_new_2000_Part_A.pdf

August 13, 2011, 01:46	Making Wave in free surface flow	#1
omidiut Senior Member omid Join Date: Apr 2011 Posts: 105 Rep Power: 15	Hi all I am trying to simulate a ship on free surface flow with sinusoidal wave that's made by wave maker. How can i simulate this sinusoidal wave as a boundary condition for investigate the motion of ship? Thanks Best regards.

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August 13, 2011, 08:18		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	There are some posts on this forum about setting ocean wave boundary conditions. Do a search for them on the forum.

August 14, 2011, 16:50	-	#3
mauricio Member Mauricio Labarca Join Date: Aug 2009 Posts: 35 Rep Power: 17	hmm well the closest i've done is a sinusoidal BC for a multiphase slug simulation... What i did is to calculate the height of the water with the sinosoidal CEL expression; then at the inlet BC i set the volume fractions of water and air to depend on an "if" cel expression; if y > (calculated height) , 1,0. that should set the air fraction to 1 if it's over your calculated height, and after yo set the water volume fraction to a similar expression you should get that sinusoidal BC. As glenn said tho I'd check all the posts in the forum anyway to see if there's something more applied to your case.

August 18, 2011, 04:07		#4
omidiut Senior Member omid Join Date: Apr 2011 Posts: 105 Rep Power: 15	Thanks mauricio. I'd check all the posts in the forum about this, but i didn't find any useful things. Best regards

August 18, 2011, 07:47		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Try: en.wikipedia.org/wiki/Airy_wave_theory and folk.ntnu.no/oivarn/hercules_ntnu/.../lwt_new_2000_Part_A.pdf