|December 4, 2013, 02:31||
negative DRAG,LIFT and MOMENT Coefficient,net mass flow rate is NOT ZERO...?
Basavaraj H M
Join Date: Oct 2013
Posts: 4Rep Power: 4
hello every one,i'm using turbulence model k-omega sst,im trying to simulate 3D model ship in viscous flow under open channel wave BC,multiphase,
X: -183m and 173m.
Y: -37.13m and 37.12m.
Z: -22.23539m and 18.9m.
mesh size near ship 2m and far away 6m.
least mesh quality 0.5342 out of 1,
models-multiphase:VOF,open channel flow,open channel wave BC,implicit.viscous:k-omega SST.
phase:air and water.
BC:inlet=turbulence intensity 5% and turbulence length scale (.07*L).L-hydraulic diameter=6.31.(L=4*A/P),Area and perimeter.velocity 4m/s.
open channel Wave BC-2nd order stokes,shallow/intermediate waves,time period 4 sec,amplitude-1m wavelength 24.98m,phase angle zero.
oulet= backflow turbulence intensity 5% and turbulence length scale .4417(I HAVE DOUBT ABOUT THIS THINK)
gradient-least squares cell based.
momentum-2nd order upwind
Volume Fraction-BGM and other are 2nd order upwind
solution control defualt, only max turbulence Viscosity ratio 1*e18.
initilization from inlet,
But im getting negative Drag, Lift and moment coefficient.net mass flow rate is not zero,reverse flow.......suggestion please Guys.
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