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April 9, 2016, 01:04 |
VOF Multiphase can‘t get converget
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yangpeisi
Join Date: Apr 2016
Posts: 2
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dear all
I am trying to simulate water flow through vertical slot fishway by means of VOF model while it can’t get convergent after numbers of try. Could anyone give me some suggestions about the project?More details are shown as follow. Problem Description: A part of fishway is choosen to be simulate as shown. The measure of the fishway is 16.8m(long)×3.0m(width)×1.2m(height) and the water depth is 0.9m.Water flow into the inlet of the fishway with a constant velocity of 1m/s. The top of the fishway is free surface. Mesh In ansys fluent’s report quality ,the maximum ortho skew is 1.50998e-01 and the minmum orthogonal quality is 8.49002e-o1.I wonder if the minmum orthogonal quality is unreasonable but have no idea how to improve it. I am a new ICEM user ,could anyone please give me some suggestions? solver type : pressure-based time : transient gravity Gravitational Acceleration x:0 y:0 z:-9.81 Model Multiphase Model Volume of Fluid Number of eulerian phases:2 VOF Sub-model : turn on open channel flow Volume fraction paramennts formulation: implicit Body force formulation : turn on implicit body force Viscous Model : k-epsilon k-epsilon model :RNG Primary phase: air Secondary phase :water Turn on specified operation density : operating density :1.225 Inlet conditions pressure-inlet Momentum Turbulent intensity :5 Turbulent viscosity ratio :10 Multiphase Turn on open channel Free surface level :0.9 Velocity magnitude:1 Bottom level:0 Outlet conditions Type pressure-out Momentum Turbulent intensity :5 Turbulent viscosity ratio :10 Upper conditions pressure-inlet Momentum Turbulent intensity :5 Turbulent viscosity ratio :10 Solution methods Scheme PISO Momentum second order upwind Turbulent kinetic energy : second order upwind Turbulent dissipation rate : second order upwind Transient formulation : second order upwind Region adaption Input coordinates X min :-4 X max :12.8 Y min :0 Y max : 3 Z min : 0 Z max :0.9 Then mark, others default Initialization method : hybrid Initialization Time step size : 0.01s Number of time steps : 3000 thanks |
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