ANSYS Fluent Tutorial: Eulerian Multiphase Flow Analysis | Water Filling in Container CFD Analysis

In this tutorial, multiphase fluid flow analysis has been carried out. The primary phase is air and the secondary phase is water. The empty container gets filled with water. This a two-dimensional, transient analysis.
What you will learn from this tutorial?
- Creating 2D geometry in ANSYS.
- Eulerian multiphase modeling.
- Creating triangular cells in meshing.
#ansysmultiphase #ansyscfd #ansystutorials

[@wisnuindrawan6496]

This is what i need thanks for the kindness

[@AnsysTutor]

You are most welcome.

[@shremanparikh6274]

Thanks for the informative video. I simulated exactly same scenario in which error popped up while converging. Finally, it converged by reducing time step size.

[@AnsysTutor]

Sometime divergence because of meshing, decreasing the time step size helps.

[@fandu8602]

Thanks for your shared, this is helpful for my research!

[@AnsysTutor]

Most welcome:))

[@e.gokcenbulut1770]

Excellent Tutorial! Thank you for your help!

[@rodneypatrick2148]

you prolly dont care but if you are stoned like me during the covid times then you can stream pretty much all of the new movies on InstaFlixxer. Have been binge watching with my girlfriend for the last few months xD

[@deandretate7392]

@Rodney Patrick definitely, I have been watching on InstaFlixxer for since november myself :D

[@paulohenriquediasdossantos9664]

Excelente Tutorial! Thank you for your help!

[@AnsysTutor]

Thank you 🙂🙂🙂

[@ryankaushal2767]

thankyou so much for this tutorial. it helps a lot.

[@AnsysTutor]

Most welcome.

[@jlaclee]

Thank you for making a good tutorial.

[@AnsysTutor]

Most welcome :) Your love and comments inspire us to do such type of tutorial for researchers.

[@airsosa]

Thanks for the video. Can you do something on plastic injection molding using fluent. Especially settings up the material and boundary conditions. Really grateful

[@AnsysTutor]

Will try to make tutorial.

[@mengyuzhang243]

Nice tutorial

[@AnsysTutor]

Thank you :)

[@ozgurbozkurt5945]

What is the difference between eulerian and VOF for transient two-phase flow?

[@fabiotadeug]

Thank. Good tutorial.

[@AnsysTutor]

You're welcome!

[@manjiriborgaonkar2976]

Hi, what will happen if I choose VOF model itself instead of choosing first Eulerian and then multi phase VOF? Can you explain how to choose particular model between these two? Also, what about the DPM (Discrete phase model)? Can I use DPM for the same example?

[@yadfaruq5294]

thank u for information sir 😊👌👌👍👍👍

[@AnsysTutor]

most welcome :))

[@mandeepk5407]

That's informative & helpful but how did you create that last animation

[@AnsysTutor]

The detail process to save an animation video has been shown in our recent upload "sloshing simulation " . Please watch this video.

[@tycoongamer2416]

awesome🔥🔥🔥🔥🔥🔥🔥🎉🎉

[@AnsysTutor]

Thank you

[@vikashkumar-cr7ee]

Hi could you please make a video on mass flow/flux inlet for same above case

[@aboalfadl374]

Hello, I have initial concentration of CO2 released from people ,of initial concentration 40000 ppm .How to define this condition ?? in cell zone condition (source term ) or boundary condition? And how to covert unit?

[@AnsysTutor]

You should put this using the patching as volume concentration

[@manjiriborgaonkar2976]

Also, if the problem involves the water at such temperature and pressure so that it is vaporized partially, what model I need to use additionally? I will need to use energy equation that's what I know for sure. But how do I take care of the phase change?

[@victsui8930]

why there is a lightning mark in ''solution''

[@AnsysTutor]

kzbin.info/www/bejne/faSvlptvnpKhmKs

[@deblinaroy8553]

Hi. Thank you so much for the video. This is my first multiphase simulation. The error that is throwing is : global courant number is greater than 250. Velocity field is probably diverging. Please check the solution and reduce time step if necessary. Should I reduce the time step size and start the simulation from beginning? Because when I’m reducing from 0.001 to 0.0005 it’s still throwing the error.

[@AnsysTutor]

You need to check the mesh. I think you need to further reduce the cell size.

[@deblinaroy8553]

Reducing the time step size worked !! Thanks a lot

[@deblinaroy8553]

I have another question. Why did you choose eulerian model and not VOF?

[@yashsarvaiya8679]

how to do the animation after solver setup

[@AnsysTutor]

It has been already shown in the tutorial , please watch untill end.

[@abhilashkasetty4044]

Hello, Can you help me on similar type of problem. I have a tank, where the water will be flowing in from top (which will be inlet) and will be drained or sucked using a pump from side. Since the tank will be empty initially, the water level inside the tank should reach the level of drain pipe (to consider, the drain pipe is located 1m from bottom). Once the water level reached this level, we need to drain the water using pump.

[@AnsysTutor]

ok will try to make a tutorial on this.

[@dilshanchrishantha6548]

what is the different between vof and eularian methods?

[@kabirjungadhikari2357]

What values did you put in time step and no. Of time steps for the complete simulation?

[@bishallamichhane4535]

No of time steps =6000 and time step size =0.0005

[@souravtripathy3228]

Sir..if we LL do abrasive jet machining simmulation using this software and after the flow of abrasive impact on the work surface what will be the configuration of work surface can we do such simmulation??

[@AnsysTutor]

sorry I have not worked in such type of simulation , but as I know It can be done, as I had seen some of the FEA tutorials in which the milling and turning simulation has been done with chips removal from the work piece, such type of analysis are non linear analysis and might be done.

[@aminshobeiri1037]

What would be the difference if you solved the problem with VOF instead of Eulerian?

[@AnsysTutor]

yes, you can do it similarly with VOF model.

[@mrunalkrishnan7563]

Hi...best hands-on for multiphase Eulerian flow...I have a doubt ..After Run, animation/time steps stop after impact on the lower wall...says "Global Courant number is greater than 250.00 The velocity field is probably diverging. Please check the solution and reduce the time-step if necessary." I thought of changing mesh to change the characteristic time but since it worked for you shouldn't it work for me too? edit: I tried making the mesh smaller by doubling the edge mesh to 2 times...now the solution runs until a quarter filling of the tank but then diverges

[@AnsysTutor]

Decrease the time step size. Increase no of iterations per timestep.

[@mrunalkrishnan7563]

@@AnsysTutor Thanks...got it..i was about to edit my comment!! you're awesome!!

[@marvinvalentin6386]

Hello. Thanks for your tutorial. It is great. I was able to follow it. However, can you please let me know how it was save into mp4 or equivalent video output? thanks

[@AnsysTutor]

Shown in this tutorial arround @19:00 kzbin.info/www/bejne/aGPHeH2qpZV2h7s

[@sreekarreddymachireddygari2797]

I have modelled exactly same as done in tutorial. But at the time of solving it says global courant number is greater than 250. Solution is diverging. How to solve this error?

[@AnsysTutor]

Improve the mesh.

[@muizharun3444]

Can i know how you solve it?

[@dimasbagussetiawan4484]

I have tried to simulate this, and solved. Thanks alot ! But now I faced a problem, I can not obtain the animation. How can I do this ? Because you did not give steps to obtain the animation. Thank you so much.

[@AnsysTutor]

you can save the animation while solving in fluent. for detail procedure you can watch our old tutorials on 2 phase flow .

[@dimasbagussetiawan4484]

@@AnsysTutor thank you sir

[@cristianaguilerarojas1151]

i have tried to simulate this, but it stops at aprox 10%, saying that its complete Am i doing anything bad? I followed the video

[@AnsysTutor]

I think you might not have decreased the residual value,so that you are getting fast result. please check and reply.

[@j_si97]

@@AnsysTutor i have this problem too it stops at 14% for me

[@j_si97]

@@AnsysTutor I looked at the console log and it says global courant number is greater than 250 the velocity field is probably diverging please check the solution and reduce time step if necessary This occurs at time step 184 and after that calculation completed window pops up

[@manuelbouchot5621]

X2. Ayy Solutions?

[@vineettiwari5027]

please make a video of a droplet of water falling in a pool.

[@AnsysTutor]

Will try to.

[@maurokillaryhernandezamado5056]

Hi! like all your videos! excellent !! i just have a doubt, i've run the simulation, but, the behavior of fluid once it enters in the container, tends to separate in round form, and this shapes impact in the wall, in agreement with your animation, the fluid travel is in a straight path, i think because it's a laminar fluid? can you explain me something about it, i've use all parameters like in the video (meshing discretization, water-air material, boundary conditions, and time step 0.001, thanks so much for your work !! Keep please! Best KZbin channel of this kind !!! Greetings from Mexico.

[@AnsysTutor]

Please share the results in our telegram group.

[@rahmatmaftuhihsan8368]

How much the iteration until the fluid steady ?

[@AnsysTutor]

the iteration continued till the complete fill.

[@dr.eng.Mostafa-Abouelsoud]

Thank you so much for sharing this nice video, but Excuse me how we can study the falling of a single droplet not continuous liquid like you have done

[@AnsysTutor]

You can do this in VOF or DPM modeling.

[@dr.eng.Mostafa-Abouelsoud]

But how can we change the velocity impact of the falling drop

[@RenGallagher101]

I have the same problem, however, I want to simulate a drop that falls with air flow. In many tutorials, the drops are used as in a tracking line and I want to know if I can make a drop and observe the phenomena of heat transfer and mass (loss of mass and drag) when I have variable diameters and temperature conditions (input and exit).

[@manuelbouchot5621]

How can I see the pressure and speed in the filling process?

[@AnsysTutor]

after initializing the solver, you need to assign which results you want to see in the result output window, according to that you can get the pressure and velocity at any particular point or zone w.r.t time.

[@manuelbouchot5621]

Thanks

[@rajanamohammed3538]

Thanks !

[@AnsysTutor]

You are most welcome.

[@nimisha9849]

Is this software can b used for seepage analysis of an earthen dam...?

[@AnsysTutor]

Yes, this software can do all the fluid flow , heat transfer, as well as structural deformation analysis.

[@nimisha9849]

@@AnsysTutor Thanks

[@ahmedhafez5859]

Thanks a lot :)

[@AnsysTutor]

most welcome🙂🙂🙂

[@punitgwalani6303]

my solution is diverging, can you help me out with that ?

[@AnsysTutor]

try to decrease the time step size, and increase the no of time steps.

[@punitgwalani6303]

@@AnsysTutor Thank you for the suggestion. Can you please do a video for the behaviour of fluid under microgravity conditions if possible.

[@charley2544]

Thanks！do you also have tutorial for PBM ?

[@AnsysTutor]

Currently we have not made any tutorial on that , will try to make one .

[@charley2544]

@@AnsysTutor thanks, what about solute diffusion in water

[@DeepakGupta-hk9vn]

Can I simulate bubble formation in water (due to the gas injection nozzle at the bottom) just by reversing the primary and secondary phases considered in the above model? Or do I need to use some other model?

[@AnsysTutor]

Yes, but you need to do it with the planer model not an axisymmetric model.

[@DeepakGupta-hk9vn]

@@AnsysTutor Thanks. I followed the same process and reversed the primary and secondary phases. Even if I am increasing the gas velocity, the bubble size is still large which should not be the case. It should be smaller but in a larger number as per the experiment data. How can I get that? Any suggestions will be appreciated.

[@rohitbisht2944]

Please share the telegram link.

[@AnsysTutor]

ANSYS TUTOR t.me/ansystutor7

[@ANKITMAURYA-vo7ls]

thanks..

[@AnsysTutor]

most welcome. 🙂

[@haddadikram]

Can you help me to design a cylindrical tank pleaaaaaaase 🙏🙏

[@AnsysTutor]

you can create it by extrude / revolve option.

[@hiteshsinha7210]

U rocks

[@AnsysTutor]

thank you:)

[@Ansys4all]

👍

[@AnsysTutor]

thank you