[Rasmusiwersen]

Hi all,

I am currently working on a free surface wave model around a cylinder.
I am running OpenFOAM version 7 on ubuntu 18.04.

I am curious as to how it is that no wavePeriods are specified in the DTCHullWave tutorial, although a (small amplitude) wave travels through the domain. Where do i specify the wave period or maybe just frequency of occurence?

Thank you!

/Rasmus

*UPDATE*
I've tried establishing the period in the wave tutorial, $FOAM_TUTORIAL/multiphase/interFoam/laminar/wave
where the surfaceelevation is written out every second. Please see attached picture.

The period is here 12.75 seconds (time from wave crest to wave crest). I cannot find where this is specified even with grep -r 12.75. Anyone??

**UPDATE**
A relation between the wavelength and wavePeriod has been established. For wavelength L=300, the period is 12.75 seconds. By halfing the wavelength, i.e. L=150, the wavePeriod is reduced by 2/3, that is approximately to T=8.5 seconds.
Again for L=75 meters the period is approximately T=5.6.

[philiplu]

hello, Rasmusiwersen,

I'm new in OF/OF-wave-simu, thus incapable to offer a decent answer concerning your Q, so I only share you some info from my side:

1. no idea of v7 yet, but in v1906, "wave" is already part of its pkg
2. in e.g. a (random) wave-tutorial-case of v1906, under "constant" dir, there's a "waveProperties" dict, where: "wavePeriod"-input

btw. I wonder:
a). did you make any results-post-processing? (if your "surfaceelev" refers to water-air-interface), it's "sharp" indeed, as in the result I attained, e.g. alpha.water, the boundary btw water/air was fuzzy
b). I also posted my Q, but get no answer yet,
BC in water wave simulation
so do you know, when the outlet is e.g. overbank-slop, instead of open-water, how to define the outlet?

as follows, there openwater-outlet uses "shallowWaterAbsorption", but how about a overbank-slop?
---------------------------------------------------------
outlet
{
alpha alpha.water;
waveModel shallowWaterAbsorption;
nPaddle 1;
}
---------------------------------------------------------


good luck

[Rasmusiwersen]

hello, Rasmusiwersen,

I'm new in OF/OF-wave-simu, thus incapable to offer a decent answer concerning your Q, so I only share you some info from my side:

Originally Posted by philiplu

1. no idea of v7 yet, but in v1906, "wave" is already part of its pkg
2. in e.g. a (random) wave-tutorial-case of v1906, under "constant" dir, there's a "waveProperties" dict, where: "wavePeriod"-input

Thank you for your considerations. In OF version 7, this option is not available in the waveProperties dictionary. I will however try and specify it, to see what error comes out of it. Is the exact syntax like this "wavePeriod 7;"?

Originally Posted by philiplu

btw. I wonder:
a). did you make any results-post-processing? (if your "surfaceelev" refers to water-air-interface), it's "sharp" indeed, as in the result I attained, e.g. alpha.water, the boundary btw water/air was fuzzy
b). I also posted my Q, but get no answer yet,
BC in water wave simulation
so do you know, when the outlet is e.g. overbank-slop, instead of open-water, how to define the outlet?

as follows, there openwater-outlet uses "shallowWaterAbsorption", but how about a overbank-slop?
---------------------------------------------------------
outlet
{
alpha alpha.water;
waveModel shallowWaterAbsorption;
nPaddle 1;
}
---------------------------------------------------------


good luck

I would appreciate it if my post can regard the wavePeriod entry only. This mitigates the confusion for future readers, so that they find answers to what they search for only. I will post you my take on your questions in your post.