How to plot interface shape between two phases.

March 1, 2005, 15:35

hi everone

Can anyone help me to plot the shape of interface between two phases. I have solved my problem using VOF scheme ( with 2 phases, air and water). Now i want to plot the shape of free surface, as well as the contour of water height with respect to initial water surface.

Please help. Thanking u..

Manoj

March 1, 2005, 17:27

I think you need to export boths data by ASCII data. Then, use another plot tools such as MatLab or TecPlot. ex, for MatLab 1. Plot initail water 2. hold on 3. Plot water height.

Is it an answer?

March 2, 2005, 04:53

Thanx James. I am going to try this now.

March 2, 2005, 10:10

FLUENT have a specific postprocessing feature for that.

Solve -> Animate -> Define In "Define" choose water volume fracion

March 3, 2005, 13:25

Hi Amir I am using steady state scheme and have got the final data after iteration. I am able to plot contours of volume fraction of water on any plane in the domain, by using swape surface feature. But how do I plot the actual deformed free surface. Is there any such feature in fluent.

Thanks

Rajkool · March 3, 2005, 13:38

Hi ...

You can plot the surface shape using the iso-surface tool in the surface menu. Once you are in the iso-surface menu, choose volume fraction option (obviously you are working with the VOF model!),choose the phase you want to analyse, and type 0.5 as constant value. Finally, go to the grid menu and select the iso-surface you have created. For better presentation, go to the options and turn the lights on.

If you want to trace the surface in transient case, you must save the data for the initial and final step you want to visualize.

Hope this should be useful.

Bye

March 3, 2005, 16:47

hi Pavel Thanks a lot. I tried it and it worked so well. Thanks again. Manoj

JohannaC · May 10, 2017, 04:31

Hi,

I'm new in simulations and now i'm stucking on a similar problem. I was able to plot the contour of the volume fraction in Fluent-Post at a certrain time step, but I need to export the geometry data at this time-step (transient simulation) to import it later into Matlab.
Do I have to write a macro?

Rajkool · April 1, 2020, 08:13

Hello Pavel,

I have the same case and I think your answer would be useful.

But, my case is a bit different. I am using steady and transient in a single calculation because both the cases are present in my model.

Please let me know, do you have any other suggestions.

Thank you
Raj

March 1, 2005, 15:35	How to plot interface shape between two phases.	#1
Manoj Kumar Guest Posts: n/a	hi everone Can anyone help me to plot the shape of interface between two phases. I have solved my problem using VOF scheme ( with 2 phases, air and water). Now i want to plot the shape of free surface, as well as the contour of water height with respect to initial water surface. Please help. Thanking u.. Manoj

March 1, 2005, 17:27	Re: How to plot interface shape between two phases	#2
James Guest Posts: n/a	I think you need to export boths data by ASCII data. Then, use another plot tools such as MatLab or TecPlot. ex, for MatLab 1. Plot initail water 2. hold on 3. Plot water height. Is it an answer?

March 2, 2005, 04:53	Re: How to plot interface shape between two phases	#3
Manoj Kumar Guest Posts: n/a	Thanx James. I am going to try this now.

March 2, 2005, 10:10	Re: How to plot interface shape between two phases	#4
Amir Guest Posts: n/a	FLUENT have a specific postprocessing feature for that. Solve -> Animate -> Define In "Define" choose water volume fracion

March 3, 2005, 13:25	Re: How to plot interface shape between two phases	#5
Manoj Kumar Guest Posts: n/a	Hi Amir I am using steady state scheme and have got the final data after iteration. I am able to plot contours of volume fraction of water on any plane in the domain, by using swape surface feature. But how do I plot the actual deformed free surface. Is there any such feature in fluent. Thanks

March 3, 2005, 13:38	Re: How to plot interface shape between two phases	#6
pavel Guest Posts: n/a	Hi ... You can plot the surface shape using the iso-surface tool in the surface menu. Once you are in the iso-surface menu, choose volume fraction option (obviously you are working with the VOF model!),choose the phase you want to analyse, and type 0.5 as constant value. Finally, go to the grid menu and select the iso-surface you have created. For better presentation, go to the options and turn the lights on. If you want to trace the surface in transient case, you must save the data for the initial and final step you want to visualize. Hope this should be useful. Bye Rajkool likes this.

March 3, 2005, 16:47	Re: How to plot interface shape between two phases	#7
Manoj Kumar Guest Posts: n/a	hi Pavel Thanks a lot. I tried it and it worked so well. Thanks again. Manoj

May 10, 2017, 04:31		#8
JohannaC New Member Johanna Join Date: Mar 2017 Posts: 3 Rep Power: 9	Hi, I'm new in simulations and now i'm stucking on a similar problem. I was able to plot the contour of the volume fraction in Fluent-Post at a certrain time step, but I need to export the geometry data at this time-step (transient simulation) to import it later into Matlab. Do I have to write a macro?

April 1, 2020, 08:13		#9
Rajkool Member Raj Join Date: Jan 2020 Posts: 92 Rep Power: 6	Hello Pavel, I have the same case and I think your answer would be useful. But, my case is a bit different. I am using steady and transient in a single calculation because both the cases are present in my model. Please let me know, do you have any other suggestions. Thank you Raj

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