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Simulating numerical wave tank and calculating wave load on vertical cylinder

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Old   July 27, 2019, 09:56
Default Simulating numerical wave tank and calculating wave load on vertical cylinder
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Amit Bharadwa
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Hi Guys

I am trying to simulate the effects of a wave on a vertical cylinder(Diameter=0.089m, draft=0.27m), with wave parameters: wavelenght=1.93, wave height=0.123m by simulating a numerical wave tank. I am using VOF, Implicit with open channel flow and open channel wave BC with sharp interface modelling with the interfacial anti-diffusion selected. The turbulence model used is K-omega SST.

I have selected numerical beach to minimise reverse flow however this is still a problem. My boundary conditions are velocity inlet and at the opposite end pressure outlet. The free surface is a pressure outlet and all other surfaces are a no-slip wall.

I have been using the PISO algorithm and have reduced relaxation factors for momentum, pressure, k and omega to help with convergence. I am analysing the wave load on the cylinder but from the results I am comparing to the paper I am trying to validate my results, the horizontal waveload exerted on the cylinder is considerablly low.

My geometry is a 3mx3mx20m tank with the free surface level at 1.5m. I have tried extended by domain to prevent reverse flow however this does not entirely go away. My question is what am I doing wrong as I am not even close to the results I am trying to validate with.

This is the paper I am trying to validate my results with:

If anyone knows what I can do please let me know or if you have any questions please ask.
Thanks in advance.
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