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-   -   Vertical Damping on OpenFoam (lambda coefficient) (https://www.cfd-online.com/Forums/openfoam/204176-vertical-damping-openfoam-lambda-coefficient.html)

OtavioDuarte July 17, 2018 00:35

Vertical Damping on OpenFoam (lambda coefficient)
 
Hello!

I am simulating a wave, using OpenFOAM, however I am having problems with reflections in the tank. To solve this problem I am trying to apply the damping, but without success.
I would like to know about the lambda coefficient used fvoptions in vertical damping. How to know the correct value to use? In the tutorial the value is 0.5, but it does not work for my wave.

Wave used:

************ {
**************** length 65.4;
**************** amplitude 0.5;
**************** phase 0;
**************** angle 0; }

option1
{
type verticalDamping;

selectionMode all;

origin (250 0 0);
direction (1 0 0);
ramp
{
type halfCosineRamp;
start 0;
duration 600;
}

lambda 0.5;

timeStart 0;
duration 1e6;
}

Thank you! :)

Thepsy April 6, 2020 11:48

help too
 
did you sucess to your problem ? I have the same.


I do not understand why the damping coefficient works for long domain and not for short.


Could someone help me ?


How to calculate lambda ?


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