mozeer
Subscriber

this is my geometry, its a storm water trap with an internal and external  chamber. the bottom part of the internal chamber has a basket (the brown and green part, the brown part is solid since i want to simulate the basket as half full. the green part is my porous media volume)


thats my meshing.


 


in fluent I am putting the following parameters:


Type: Pressure-based


Velocity Formulation: Absolute


Time: Transient


 gravity -9.81


VOF multiphase model


N of Eulerian Phase: 2


Formulation: Explicit


Interface Modelling: Sharp


 


k-epsilon realizable turbulence model


 


Phase 1: air


Phase 2: water


Surface tension: 0.072 constant


 


cell zone conditions



i have got the values for porous media from experimental work, plotting pressure against velocity as per Workbench guide. 


Boundary Conditions:


 


Water Inlet (velocity-inlet type)


V: 0.45 m/s


Initial Pressure: 0


TKE: 1


Epsilon: 1


Phase 2 fraction: 1


 


Outlet (pressure outlet)


 


top (pressure outlet)


 


 


 


Solution Methods:


Pressure-Velocity Coupled (i have tried PISO as well)


Pressure: PRESTO!


Momentum: Second Order Upwind


Volume Fraction: Compressive


TKE: First Order Upwind


Turbulent Dissipation Rate: First Order Upwind


Transient Formulation: First Order Implicit


 


Solution Control:


Flow Courant: 200


Eexplicit RF


Momentum: 0.3 (i have tried the default as well)


Pressure: 0.3


Under RF


Density: 1


Body Forces: 0.5


TKE: 0.6


TDR: 0.6


Turbulent Viscosity: 0.5


Discrete Phase: 0.9


 


std Initialization from inlet


Time step size: 0.001(I have tried 0.01 as well)


N of time step: 1000000


 


would be great if you could help.


Thanks


Ikhlass