CFD Tutorial - Shock Waves from high pressure burst | FLUENT ANSYS


This CFD Ansys tutorial will show you how to simulate a flow from a high pressure burst of compressed air of a spherical shape object. The blast was triggered by the release of the highly pressurized air to the atmosphere causing shock waves. The ideal gas law and the pressure based solver were used in this simulation alongside with the K Omega turbulent model. This tutorial was completed on Fluent a package that is part of ANSYS Software

To download the geometry, please visit this page:

Channel:  Raef Kobeissi
Hamid R. Ahmadi 

The video was perfect. Thanks.

Tanmay Patel 

can you please help me to create this geometry in fluent ansys. what are the steps for geometry?


hello, can I ask you how long time does this model take you to simulation?

Alok Tiwari 

Hey , Video is nice and informative. I have a doubt while simulating compressible gas we are suppose to use density based solver. Can u pls tell me why you have used Pressure based solver for this compressible flow ( which is in supersonic range).

Roshan Mali 

Hi, plz upload for Shock tube

Roshan Mali 

Can you plz upload shock wave simulation for shock tube

Umut Yıldız 

Hi Everyone

My question is if we want to use a different gas in the sphere. Should we use multiphase or do something extra?


Thank Raef. I need one video for shock tube modeling

Tejas basim 

hello sir, can you please make a video on blast load acting on a RCC column. it'll be helpful. thank you.!!

Netajiravikiran Kesana 

Thank you. Can you please show the similar example in CFX as well?

Mutaz Algrbawi 

no geometry found will you check it again

i download it once i import it no geometry generated !!!

Vladimir Shentsov 

Hi Raef,

It is indeed really cool stuff, thank you for the video. The thing I'm trying to do is to simulate similar scenario but with use of real gas instead of ideal as in your case. The second thing is to use hydrogen instead of air inside the sphere, and above that to have it burned to involve species transport with chemistry. Do you have any particular experience in that? I have shared with you my movie with ideal gas and combustion have look please. It would be great to have a chat with you in case you might have any ideas how to tackle the problem. Thank you very much in advance!

rohan verma 

hello sir i have problem in simulating a shockwave in shock tube.... i have followed a same concept as shown in vedio...but didn't got success...... can you make a vedio simulating shock wave in shock tube it is very beneficial in my research..... thank you

Nguyen Van Duc 

Dear Sir! I did exactly as your teaching ! Unfortunately, after two steps I got an error with messages: celletropy: Reference Pressure Value is set zero in the Reference Value Panel !! Please give me advice how to solve this problem! I am really appreciate your help! Thank you!

Vladimir Kupriyanov 

Thank you for nice tutorials, i've learned a lot!

Dorodi Krishty 

Hey, so I had to come around your simulation once more and ask you an important question about patching density. So I'm trying to simulate the exact same problem but use one of the equations of real gas and a UDF for describing the density at the initial moment. For instant the UDF would describe the density inside the sphere to be 1000 kg/m3 and outside to be 0.1 kg/m3. Then how/where would I input this UDF? I'm guessing this is similar to patching, but since there is no option for choosing density I'm trying to figure out a way to input the UDF.

Thanks in advance

Dorodi Krishty 

Hello Raef, I have used your simulation as an example and I have tried to simulate 1/4th of the model. My question is would it affect my simulation if I did not have the contact surface between the atmosphere and sphere? In my case I don't but I want to know if it is essential for the burst to happen

Sijo Varghese 

Really good video. Thank you. Can you tell me how to render only the interior of the ambient body and rest of the background as black. And which animation is used here?? keyframe or time step? how to create the animation? Thanks again.

Dorodi Krishty 

Hi is it possible to decrease the number of time steps or maximum iterations per time step once the solution proceeds? Or would it affect the ultimate solution?

Dorodi Krishty 

Thank you for this useful video! I just have one problem, when I try to run Fluent after following all the instructions I get the error- Error: Cortex received a fatal signal (SEGMENTATION VIOLATION).

Error Object: ()

Could you please tell me what I can do to prevent this?


This video was really interesting. Can shock waves from supersonic flow also be visualized like this?

Benjamin Das 

Sir, can you explain about local thermodynamic equilibrium diffusion approximation method


That was nice, ever tried a sound wave simulation?

Hans-Kristian Norum Eidesen 

Very good!

Ivan Aspirant 

Charming video. shockwaves is something enigmatic )

shahid khon 

nice video