flowRateInletVelocity in tabular form does not work

shock77 · October 16, 2020, 13:52

Hi,

I am trying to run a simulation with rhoCentralFoam and OpenFOAM4. I am modelling the outflow from a pressure vessel into the free enviroment.

My BCs are:

Inlet:

p - uniformTotalPressure (tabular)
T - uniformTotalTemperature (tabular)
U - flowRateInletVelocity (tabular)

Outlet:

p - waveTransmissive
T - inletOutlet
u - inletOutlet

I try to implement the flowRateInletVelocity as follows:

Code:

inlet
    {
    type flowRateInletVelocity;
    rhoInlet        1.2;           // for the initial timeStep? Otherwise it doenst run
    rho            rho;
    massFlowRate table
    (
    (    0    0    )
    (   0.00013 0    )    
(    0.00014    0.237883    )
(    0.00015841    0.251926    )
...
);
}

Unfortunately the massflow at the inflow just becomes 0 and I have not the slightest idea why.

Kind regards,
shock77

shock77 · October 20, 2020, 03:29

It works now.

Actually I am not sure why, since I didnt do any important changes. I guess the simulation terminated before the mass flow could develop itself.

October 16, 2020, 13:52	flowRateInletVelocity in tabular form does not work	#1
shock77 Senior Member Join Date: Dec 2019 Posts: 215 Rep Power: 7	Hi, I am trying to run a simulation with rhoCentralFoam and OpenFOAM4. I am modelling the outflow from a pressure vessel into the free enviroment. My BCs are: Inlet: p - uniformTotalPressure (tabular) T - uniformTotalTemperature (tabular) U - flowRateInletVelocity (tabular) Outlet: p - waveTransmissive T - inletOutlet u - inletOutlet I try to implement the flowRateInletVelocity as follows: Code: inlet { type flowRateInletVelocity; rhoInlet 1.2; // for the initial timeStep? Otherwise it doenst run rho rho; massFlowRate table ( ( 0 0 ) ( 0.00013 0 ) ( 0.00014 0.237883 ) ( 0.00015841 0.251926 ) ... ); } Unfortunately the massflow at the inflow just becomes 0 and I have not the slightest idea why. Kind regards, shock77

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October 20, 2020, 03:29		#2
shock77 Senior Member Join Date: Dec 2019 Posts: 215 Rep Power: 7	It works now. Actually I am not sure why, since I didnt do any important changes. I guess the simulation terminated before the mass flow could develop itself.