General flow

Predicting fluid flow field, turbulence, free surface, wave body interactions, etc.

l Pressure, velocities, and vortex structure distribution and instability.

l Turbulence features.

l Fluid-body interaction, body forces, moments and 6DOF motions.

l Waves and wave breaking.

l Others.

Computation conditions

l Laminar flow with Re=100 and Re=1000.

l 30×2×30 hexahedral cells.

Grid arrangement Velocity distribution (Re=100) Velocity distribution (Re=1000)

u velocity distribution (Re=100) w velocity distribution (Re=100) u velocity distribution (Re=1000) w velocity distribution (Re=1000)

Computation conditions

l The streamwise length and height of domain is 1 and 0.5 respectively.

l Reynolds number based on the benchmark of plane length is 1.03E+07.

l 200×2×80 hexahedral cells.

Grid arrangement Pressure W velocity

Comparisons of the profiles of u+ vs y+ between CFD (K-Omega/K-Epsilon model) and EFD results (Wieghardt’s results) in different sections along streamwise direction

Computation conditions

l Hexahedral and prismatic elements.

l Domain dimension: x: 0-0.5, z:0-0.2.

l Laminar flow of Reynolds number is 100.

Grid arrangement and pressure distribution Pressure and velocity distribution

Computation conditions

l Reynolds number is 7.10E+06, first grid to wall: y+ <1.

l Hexahedral elements with 615,000 nodes.

l Non-dimensional time step: 0.01.

Grid arrangement Typical convergence history of the non-linear Picard iterations Time history of total resistance along x direction

                                                                  Comparison of vortex structures (Q=30, colored by u)



                                      Comparison of pressure distribution at the symmetry plane between current unstructured grid code and CFDSHIP-Iowa

Computation conditions

l Reynolds number is 1.0E+04

l 4 kinds of hybrid elements (Hexahedral, tetrahedral, prismatic, and pyramid)

Grid arrangement Pressure on boundaries (near the section of y=0) Pressure and velocity (section of z=0)

Computation conditions

l Reynolds number is 485, no turbulence model.

l All are tetrahedral elements: coarse grid, no refinement grid for boundary layer.

　
Grid arrangement Pressure and velocity distribution

                                    　

                                                                                    Pressure and velocity in y sections

Motion

Computation conditions

l Fr=1, Re=100.

l 50×2×37 hexahedral cells in the domain of x(-1,1) and z(-1, 0.1).

l Analytical solution : Wu et al. (2001).

l Initial free surface profile (A=0.01, d=1).

　
Grid arrangement Free surface elevation evolution in a tank for different time Wave amplitude evolution at the center of 2D tank

Computation conditions

l Submerged smooth bump.

　

                                                                           Movie


                       Comparison of CFD and EFD for an impulsive plunging wave

                                                            Velocity and piezometric pressure at time=1.9 (first splash)