Fluent wave elevation

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  • Last Post 17 March 2019
Kedar posted this 04 February 2019

I have created wave using ansys fluent. I want to plot wave elevation vs distance in fluent. Please help.

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rwoolhou posted this 04 February 2019

If it's 2d create an isosurface of VOF = 0.5   Then create an xy plot where you plot x & y positions on their respective axis of the isosurface. 

In 3d create an isosurface/plane along the centre of your domain and then create the above isosurface having selected that plane and repeat the xy plot. 

 

As an aside, this should be in the Fluids part of the community. I'll move it once you've seen my reply. 

kkanade posted this 05 February 2019

as rob suggested, moving to fluid dynamics category 

Neha posted this 07 February 2019

I have generated waves in fluent in 3d. I want to plot wave elevation Vs time.I have followed the above procedure i have a doubt in what repot type and field variable i have to choose. Please help

rwoolhou posted this 07 February 2019

The above will show the free surface height at a set time. You'd need to repeat for every time step. 

Do you want the surface at every time or the water height at a specific location with time? 

Neha posted this 07 February 2019

I want to plot water height at specific location with time.

Neha posted this 07 February 2019

My domain height is 2 m with a water depth of 1.4 m . I have generated stokes second order waves.I have placed a point at 1.4m and marked the region of water and air and have done patching and then tried to monitor area weighted average Vs time. Is it the right way to find water elevation at a location with time ? I am little confused . Please help

kkanade posted this 08 February 2019

create a vertical line. then create a isosurface for this line with vof with isovalue of 0.5 

then monitor z coordinate of this new isosurface. 

Neha posted this 08 February 2019

What should be the length of the line. Should it be the entire height of domain or only depth of water. After creating isosurface  for the line, to monitor Y coordinate( depth) should i chose Mesh and Y coordinate from field variable? What report type i should choose (area weighted average or Max vertex )?

kkanade posted this 08 February 2019

yes length should be height of domain. 

choose depth y coordinate.

max vertex.

Neha posted this 08 February 2019

Sorry i am not getting the proper profile of wave (sinusoidal wave). I am getting a line kind of plot. I don't know where am i going wrong. can u please help with step by step procedure. so that i can check where i am going wrong.

rwoolhou posted this 08 February 2019

Please can you post the plot image? The one drawback of the above approach is that it gives the cell facet height: if the mesh is coarse the curve will not be very smooth. 

Neha posted this 08 February 2019

Neha posted this 08 February 2019

 I am sure that it is completely wrong plot i have obtained. Can u please tell me in step wise so that I do it again and check what I have been giving wrong input.

Neha posted this 08 February 2019

My wave height is 125 mm and 1.3 sec time period. I have generated stokes second order wave. Length of my domain is 14m and I have placed a vertical line at 2m from inlet .

kkanade posted this 11 February 2019

can you please insert images of your iso surfaces, lines, point etc. 

also mention the procedure you used for the same. 

give in details as much as possible. 

rwoolhou posted this 11 February 2019

Please refine the scale on the graph (try 1.4 < y < 1.5) and plot the mesh on the plane you show the wave on. I think your mesh is too coarse to pick up the wave height but I'm making an educated guess until I see some pictures. 

Neha posted this 11 February 2019

Neha posted this 11 February 2019

Might be it is meshing mistake or some other minor mistake while creating a line . Now I have got a plot as shown above. I am trying to validate the above plot with below mentioned image. The amplitudes are not matching

Neha posted this 11 February 2019

rwoolhou posted this 11 February 2019

The amplitude is not far off if I'm reading the chart right: the issue then is the frequency if you're comparing both charts. Check you've got enough mesh to accurately pick up the free surface. The first cycles will always be out as the solver is pushing the initial state solution out of the domain, I'd be looking at comparing from about 5s onwards (second chart). 

mdfaizan444 posted this 12 February 2019

I am working in 2D numerical wave tank and got similar type of profile (straight line). But now what i have to do quite not understanding? Any help plz...

rwoolhou posted this 12 February 2019

Can you add some pictures and start a new thread? We can link later as needed. 

mdfaizan444 posted this 12 February 2019

I am getting this type of graph and it is increasing in y direction. Where i am doing wrong?

 

 

abenhadj posted this 12 February 2019

1/Screenshot of your wave Inlet boundary

2/How many cells do you have across a wave length

3/How many cells do you have across the wave height

Best regards,

Amine

Neha posted this 14 February 2019

I was trying to generate a solitary wave in 2d . The depth of water is 1m but the plot doesn't start from 1m . And also the ripples are generated before the solitary wave . How to solve this issue ? Please help

Neha posted this 14 February 2019

rwoolhou posted this 14 February 2019

How is the water entering & leaving the domain, and what are the settings in the velocity boundary panel? 

If you look at the graph, the position zero marker is significantly lower than the next point: have you tried pushing in too much water? 

Neha posted this 18 February 2019

 

how to get force time history on a plate (2d)?  subjected to stokes 2nd order waves.

Vaishnavi posted this 15 March 2019

Hi Neha You will have to select a FSI for the plate surface. Then you can obtain results directly on the plot

Vaishnavi posted this 15 March 2019

Can you tell me how you got the y vertex vs flow time x-y plot? I've followed the above procedure and my run is complete. Where to view this results of which you have shared the screenshot?

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