[pizicai]

hello, Niels,

I want to model a solitary wave impacts on a fixed plate above SWL. in this model, the wave is generated by Wave2Foam and the mesh is created by snappyHexMesh, that means the plate is just digged out from a plate (this is a 2D model), whose surface is defined as walls. the model could be seen in photo named "model description"

my problem is: before the wave comes through the plate, the water close to the plate produce velocity, you can see the details in the photo named "velocity_graph_before_wavecomes", as a rusult, the plate carry some force from water before wave comes, which could been seen in the photo named "plate_genwave_z"

i am suspicious that there is some problems with "waveProperties.input". you can find it in the zip-file named "plate_solitary_model"

I wonder if it is obligatory to set outlet BC as potential wave when I just want the water flow out smoothly, could I just set a relaxationzone without setting potential wave? what is interesting is water in the whole domain rotate with a small velocity from start, which i assume is caused by potential wave?

(all files could be found in dropbox, link has been attached)
https://www.dropbox.com/sh/duwtl5pym...JzR62FjTZJFB4a

[ngj]

Good evening,

@Pizicai: I am unfortunately not in a position, where I can help you with resolving your problems. It sounds like a classical generation of energy on refined meshes due to non-balanced momentum equation in interFoam.

Kind regards,

Niels

[pizicai]

Hello, Niels,

Thanks for your prompt reply. Actually, I found the mistake afterward. This is supposed be a 2D model, however, after snappyHexMesh, the mesh around the plate has more than one grids, after I run extrudeMesh, the chaos around plate before wave comes disappears. sorry to ask this question without a careful check.

By the way, my last question still exists, I wonder if it is obligatory to set outlet BC as potential wave when I just want the water flow out smoothly, could I just set a relaxationzone without setting potential wave? I tried delete 'wave type' part and kept
relaxationzone definition part of the "outletcoefficients section', and the result is it cannot run.

[ngj]

Good afternoon,

@Pizicai: The use of relaxation zones is the way to have waves smoothly leaving the domain in waves2Foam. There are other methods in the literature, but they are not implemented in waves2Foam. You cannot define a relaxation zone without defining all the required properties.

Kind regards,

Niels