Overview ======== + W3 example case of hydrodynamics of a planing hull Mesh ==== + The example includes two different approaches for meshing the case + The first approach uses no cell refinement in the vertical direction + The second approach includes local cell refinement, producing a smaller mesh + Cell refinement can cause disturbances of the interface + Where refinement is present, PLIC-based schemes perform much better, producing far less interface disturbance than the standard interface compression scheme. + The first approach has the advantage of avoiding interface disturbances but for the potential cost of a larger mesh than with local refinement Experimental results (ref. 1) ============================= + Velocity = 4.598 m/s + Trim angle = 3.485 deg + Drag = 50.691 N Numerical results mesh 1 ======================== Without local refinement + Velocity = 4.598 m/s + Trim angle = 2.794 deg + Drag = 48.616 N Numerical results mesh 2 ======================== With local refinement + Velocity = 4.598 m/s + Trim angle = 3.027 deg + Drag = 47.987 N Acknowledgment ============== + Thanks to Raffaele Ponzini, Ph.D. Eng. from CINECA, for kindly sharing the W3 hull geometry and for his valuable insight into the science of ship hulls References ========== 1. Begovic, E. and Bertorello, C., 2012. Resistance assessment of warped hullform. Ocean Engineering, 56, pp.28-42 2. Ponzini, R., Salvadore, F., Begovic, E. and Bertorello, C., 2020. Automatic CFD Analysis Of Planing Hulls By Means Of A New Web-Based Application: Usage, Experimental Data Comparison And Opportunities