[grazarr]

Dear all,
I'm trying to obtain numerical/lab data similarity of a solitary wave travelling down a waveflume acting on a rigid endplate.
Attached are my latest set of results with numerical data shown in black and existing lab data shown in red.

Lab wave parameters are:
Amplitude: 0.042m
Water depth: 0.2m

Numerical parameters (using waves2foam solitaryFirst waveType):
height: 0.072 (m)
depth: 0.4 (m)
direction: (0.5 0 0) (m/s)
x0: (0 0 0)

I am slightly concerned because in order to achieve the numerical results shown in the figure I had to increase the depth parameter to 0.4m; however my mesh is set to the depth of the lab flume (0.2m). How will the accuracy of my results be affected by this considering I will eventually be investigating the pressure distribution at the end plate?

There is also an input difference of 0.03m in amplitude between sets of data. Can anyone suggest to me why parameters I input into the program produce variations measured by the wave probes.

Also finally how would one suggest I adjust the numerical parameters to achieve more accurate incident solitary wave length.

Note:
-Wave probes are located at distances 3x, 8.5x and 18.5x water depth which correleate to 0.6m, 1.7m and 3.7m from the end plate respectively. (data from time=4.7 - t=8s represent wave reflections).
-OF v2.40

Kind regards
Greg Nichols

[ngj]

Hi Greg,

You should check for numerical diffusion and check that the implementation of the solitary wave is correct. It could also be that the first order solitary wave is not accurate enough, see earlier posts by other users.

Kind regards

Niels