[waves2Foam] Average wave elevation decreases along the propagation axis

ConstanceC120 · June 13, 2018, 08:43

Hi everyone,

I am currently modelling a Numerical Wave Tank (NWT) thanks to OpenFOAM using the toolbox waves2Foam. The solver waveFOAM allows to generate and absorb waves and also to track the free surface. My simulations run and I have great results!

However, I observe that the average wave elevation depends on the place in the NWT. In the generation and absorption zones, this is explained by the relaxation method implemented in the solver. But between these two zones, in the "CFD zone", the average elevation decreases linearly in function of the abscissa along the wave propagation axis.

I changed the size of generation and absorption but it does not have an impact on results.

Is it a problem you have already observed ?

Thanks a lot in advance !

Constance

ConstanceC120 · June 18, 2018, 05:24

Hi everyone,

I am currently modelling a Numerical Wave Tank (NWT) thanks to OpenFOAM using the great toolbox waves2Foam.

I observe that the average wave elevation depends on the place in the NWT. In the generation and absorption zones, this is explained by the relaxation method implemented in the solver. But between these two zones, in the "CFD zone", the average elevation decreases linearly in function of the abscissa along the wave propagation axis.

I changed the size of generation and absorption but it does not have an impact on results.

Is it a problem you have already observed ?

Also, I am wondering if it is better to control simulation with a little Courant Number (maxCo) or a little deltaT (maxdeltaT) in controlDict ?

Thanks a lot in advance !

Constance

June 13, 2018, 08:43	Average wave elevation decreases along the propagation axis	#1
ConstanceC120 New Member Constance C Join Date: Jun 2018 Posts: 2 Rep Power: 0	Hi everyone, I am currently modelling a Numerical Wave Tank (NWT) thanks to OpenFOAM using the toolbox waves2Foam. The solver waveFOAM allows to generate and absorb waves and also to track the free surface. My simulations run and I have great results! However, I observe that the average wave elevation depends on the place in the NWT. In the generation and absorption zones, this is explained by the relaxation method implemented in the solver. But between these two zones, in the "CFD zone", the average elevation decreases linearly in function of the abscissa along the wave propagation axis. I changed the size of generation and absorption but it does not have an impact on results. Is it a problem you have already observed ? Thanks a lot in advance ! Constance

June 18, 2018, 05:24	Average wave elevation decreases along the propagation axis	#2
ConstanceC120 New Member Constance C Join Date: Jun 2018 Posts: 2 Rep Power: 0	Hi everyone, I am currently modelling a Numerical Wave Tank (NWT) thanks to OpenFOAM using the great toolbox waves2Foam. I observe that the average wave elevation depends on the place in the NWT. In the generation and absorption zones, this is explained by the relaxation method implemented in the solver. But between these two zones, in the "CFD zone", the average elevation decreases linearly in function of the abscissa along the wave propagation axis. I changed the size of generation and absorption but it does not have an impact on results. Is it a problem you have already observed ? Also, I am wondering if it is better to control simulation with a little Courant Number (maxCo) or a little deltaT (maxdeltaT) in controlDict ? Thanks a lot in advance ! Constance

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