Vof waves in star ccm+

dai549592484 · October 23, 2013, 16:30

Hi all

Since the generation of wave is build in star ccm+ and for some reason, it is not that easy to monitor the wave elevation time history at some certain point in the wave field. Thus there's few investigation into the wave generating ability of star ccm+( I mean by using the build in vof wave method).

Recently, I've carried out some simulation about numerical wave tank using star ccm+ and found that wave generated using first order wave is not good( the time history of the wave elevation at certain point is not stable compared with the result gain by FLUENT). Is there anyone else who has experienced such problem?

ryancoe · October 25, 2013, 11:10

Could this be because 1st-order waves are physically unrealistic and therefore not supported by the governing equations being enforced in the simulation (this doesn't explain why Fluent would give better result)?

dai549592484 · October 25, 2013, 11:20

Hi Ryan

In my view, it is ture that linear wave are physically unrealistic and for those CFD solve the problem based on N-S equation, it is not possible to generate exact first order linear wave, thus the result calculated by FLUENT is some more like 2nd order wave. However, it should not make the result unstable, I mean there should not be too much difference between each wave trough or crest.

ryancoe · October 30, 2013, 08:30

I suppose that the most likely culprit for a changing waveform at a set location would be reflections.

October 23, 2013, 16:30	Vof waves in star ccm+	#1
dai549592484 Member David Join Date: Nov 2011 Posts: 39 Rep Power: 14	Hi all Since the generation of wave is build in star ccm+ and for some reason, it is not that easy to monitor the wave elevation time history at some certain point in the wave field. Thus there's few investigation into the wave generating ability of star ccm+( I mean by using the build in vof wave method). Recently, I've carried out some simulation about numerical wave tank using star ccm+ and found that wave generated using first order wave is not good( the time history of the wave elevation at certain point is not stable compared with the result gain by FLUENT). Is there anyone else who has experienced such problem? Loux27 likes this.

October 25, 2013, 11:10		#2
ryancoe Member Ryan Coe Join Date: Jun 2010 Location: Albuquerque, NM Posts: 98 Rep Power: 15	Could this be because 1st-order waves are physically unrealistic and therefore not supported by the governing equations being enforced in the simulation (this doesn't explain why Fluent would give better result)? __________________ Ryan

October 30, 2013, 08:30		#4
ryancoe Member Ryan Coe Join Date: Jun 2010 Location: Albuquerque, NM Posts: 98 Rep Power: 15	I suppose that the most likely culprit for a changing waveform at a set location would be reflections. __________________ Ryan

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October 25, 2013, 11:20		#3
dai549592484 Member David Join Date: Nov 2011 Posts: 39 Rep Power: 14	Hi Ryan In my view, it is ture that linear wave are physically unrealistic and for those CFD solve the problem based on N-S equation, it is not possible to generate exact first order linear wave, thus the result calculated by FLUENT is some more like 2nd order wave. However, it should not make the result unstable, I mean there should not be too much difference between each wave trough or crest.