I am trying to simulate a VOF 5th-Order wave in Star-CCM+. The wave shall be 4.2 m long and 0.094 m high. For this I use a domain which is 5 wave lengths long. The two last wave lengths are used for damping.
Despite the dampening zone, there is an overlapping wave, which is getting smaller and smaller starting from the outlet.
This wave is visible in the Line Integral Convolution of the velocity (see VelocityZoom.png ) and through the deformation of the water surface in the area of the overlapping (see Wave Cut Profile.png). Is this normal or can i do something better about my damping?
I already tried a longer damping zone (3 wave lengths) and a porous region but it showed the similar effect of reflection.
Hi, would you please show the reflection zone more clearer? explain why are you using damping model?
Moritz Graumann
Hi, would you please show the reflection zone more clearer? explain why are you using damping model?
Moritz Graumann
Hi, try to use the forcing method , at sides and outlet.
check the below link.
https://www.researchgate.net/deref/http%3A%2F%2Fwww.star-global-conference.com%2Fsites%2Fdefault%2Ffiles%2Fvideos%2FMilovan%2520Peric.mp4
best regard
Hi Reza,
To prevent wave reflections Star-CCM+ recommends forcing or damping. I use damping because I later there will be a body included that will weaken the waves energy so they after will be closer to a flat wave then to the original. I am also using the damping model because it appears to be more stable since I got floating point errors using the forced model.
Here is a more detailed picture of the reflected wave.
Hello Arefhossein Moalemi,
the point of why I am not using forcing is, that I will integrate a wave energy converter (WEC) into the domain to analyze the interaction with the wave, when the wave is as expected. To not affect the amount of energy taken off by WEC it is not possible to use forcing at least at boundaries around or behind the WEC.
Check the grid resolution of your simulation. I think the amount of cells are not enough. Use the 2D mesh instead of the 3D one.
Yes, you’re right, I send a simulation file in attachment for you.
it is a correct simulation under damping wave condition.
again make sure you check the bellow link, it is very helpful.
https://www.researchgate.net/deref/http%3A%2F%2Fwww.star-global-conference.com%2Fsites%2Fdefault%2Ffiles%2Fvideos%2FMilovan%2520Peric.mp4
Thank you Arefhossein Moalemi for the link to the video. It really helps me a lot.
Hi @Yujin Lu,
I figured out, that the "point on water level" in my simulation has a lasting influence.
There was a velocity structure that kept being under the position of the first wave front.
You can see the structure on the left side under the free-surface on the velocityZoom.png.
To avoid this I placed the point on water level directly on the inlet and applied forcing in addition. Since that the small waves did not happen any longer.
Could you check if you have the same lasting Problem with the first wave front setting of you VOF Wave. I would be interested if others have the same problem.
Also check this presentation link for HRIC and IMD which are able to eliminate wriggles:
Milovan Peric, Best Practices for Flow Simulations With Waves, Star Global Conference 2017: http://www.star-global-conference.com/sites/default/files/public_pdf_presentation/SGC2017%20CoMeT%20Milovan%20Peric.pdf
hi Arefhossein Moalemi , I have the problem to create the waves in starccm. can U please share the link of the video? because it can't be open again.
thanks
Arefhossein Moalemi, do you still have a mp4 version of Peric files. I tried the link that you have sent above but I couldnt access to the page.
Marcus Jia Wei Chong Abid Paripurna Fuadi https://drive.google.com/file/d/1Y8WbTvahEis-3---6xOo9r5ZAFa-fiRC/view?usp=sharing
Moritz Graumann Hi, do you still have the pdf and mp4 version of Peric files? I tried the links, but found nothing.
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