{"id":160360,"date":"2021-07-14T06:06:13","date_gmt":"2021-07-14T06:06:13","guid":{"rendered":"\/forum\/forums\/topic\/wave-generation-in-deep-water-wave-is-getting-damped\/"},"modified":"2022-03-19T00:16:59","modified_gmt":"2022-03-19T00:16:59","slug":"wave-generation-in-deep-water-wave-is-getting-damped","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/wave-generation-in-deep-water-wave-is-getting-damped\/","title":{"rendered":"Wave generation in deep water (wave is getting damped)"},"content":{"rendered":"
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I need to do wave generation for deep water<\/strong> condition in 2d or 3d<\/strong>. I think 2D is sufficient.<\/p>\n

 I have tried with fines mesh like 100 cells per wavelength and 20 cells per waveheight<\/strong>.<\/p>\n

 The basic requirements are, deep water conditions<\/strong>, wave shouldn’t get damped, first order airy theory<\/strong> and K-w SST<\/strong> model for turbulence. <\/p>\n

 For wave generation I have used open channel wave BC<\/strong>, Implicit body force<\/strong> and Sharp<\/strong> from interface modelling. Interfacial Anti-diffusion<\/strong> is also ticked.<\/p>\n

 In order to avoid reflection from opposite wall, numerical beach<\/strong> is provided over two wavelengths from opposite wall.<\/p>\n

 For Pressure- Velocity coupling SIMPLE<\/strong> scheme is used, Pressure – PRESTO<\/strong>, momentum – second order upwind<\/strong>, Volume fraction – Modified HRIC<\/strong>, Turbulent K.E- second order upwind<\/strong>, Sp. Dissipation rate – second order upwind<\/strong>, transient formulation – second order implicit<\/strong>.<\/p>\n

 For very low values of k and w (1e-06), the wave is not getting damped and I am getting expected results but when I am initializing simulation with calculated values of k and w, it gets damped.<\/strong><\/p>\n

 For reference, I have followed<\/p>\n

1)     Numerical simulation of an oscillating water column device using a code based on Navier – Stokes equations.<\/p>\n

2)     CFD modelling of a small–scale fixed multi–chamber OWC device<\/p>\n

 3)     Fluent user manual<\/p>\n

4)     Fluent user guide<\/p>\n

5)     Scaling and air compressibility effects on a three-dimensional offshore stationary OWC wave energy converter<\/p>\n

6)     Tutorial: Heave and Pitch Simulation of Ship hull moving through head sea waves.<\/p>\n

 <\/p>\n

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\n17 march original1.mp4
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