ANSYS Tutorial | Flow in a Convergent- Divergent Nozzle | Compressible Flow Part 1/2

Consider a convergent-divergent Nozzle in which Ideal Gas is flowing. At the inlet, the Stagnation Pressure is atmospheric pressure, at the exit the pressure is lower than the inlet. At the throat section of the nozzle, the velocity increases and pressure decreases. At the converging section, the flow was subsonic, and as the fluid accelerates towards the throat, the Mach no. increases and the flow become supersonic at the exit.
What to learn from this tutorial?
- Creating the axisymmetric nozzle geometry.
- Use of Face Split.
- Creating structured Mesh.
- Extracting Solution data for the desired result (Mach no).
- Density-based solver setup.
- Compressible fluid flow modeling.
- CFD Post Processing
Part 2 of the Tutorial: • ANSYS Tutorial | Flow ...
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[@danish5326]

I come here for the background music

[@arshamshahrooei7984]

What a nice mesh! Great!

[@AnsysTutor]

Thanks.

[@yadfaruq5294]

very nice teacher 👍👏👏👏👏👏👏👏👍😊

[@AnsysTutor]

thank you.

[@bawalogcoc3162]

What is the use of face splitting and where else can we use it?

[@AnsysTutor]

Face splitting is a method to divide the surface, its most used if you want a custom mesh for any region.

[@dhanishaswins1184]

Can anyone tell me how to bring the outline tab in mesh generator.It just went off.

[@AnsysTutor]

Reset the layout or reset the meshing.

[@shravanmishra4429]

Many many thanks. What is NPR(nozzle pressure ratio)? and What is NPR in this simulation?

[@shivakarthiksaichinthala1365]

how to resolve negative volume cell error ?

[@AnsysTutor]

Remesh it.

[@aarohimudholkar6898]

I am not getting the option of size function itself (to change from uniform to curvature).

[@AnsysTutor]

This option has been removed in the newer version.

[@pragyan11114]

Can I get shock wave plot in results??

[@AnsysTutor]

you have to figure it out from the velocity plot /Mach no plot.

[@krishnasaipinni4044]

I am not able to get face split it is showing error as : invalid face selection

[@AnsysTutor]

check the line ends are conciding with the geometry line or not.

[@marysobha4614]

Can u do aeropsike nozzle?

[@AnsysTutor]

Send the geometry details to [e-mail], will try to make it.

[@marysobha4614]

Can u provide me with any code that give shape of an aeropsike nozzle?

[@AnsysTutor]

Provide me the coordinate points for the shape, I could generate the shape in Ansys design modeller.

[@mrunalkrishnan7563]

Hi..I get a "Plugin error no valid bodies found for 2d analysis in part" error while trying to open Meshing..it works when i change analysis to 3D but later the Run calculation gets an internal error for every iteration!! Can you please help?

[@mrunalkrishnan7563]

solved the issue!! I had to Create a surface on the XY plane and the axis must be the X-axis and the surface must be on the +Y side of the X-axis. Then no error

[@yasserbicycle7734]

hello someone can help me on hight temperaature please? 1000 k - 2000 k-3000k i have a divergence , i need a help

[@AnsysTutor]

do, hybrid initialization.

[@baraandre3731]

I still dont understand what the uses to spliting the face

[@AnsysTutor]

Split face is used ,so that you have a better control over the meshing.

[@mend3z831]

For the mesh sizing how do you determine the number of division to use? I noticed that the bigger the area of the section the larger the division number is. Would it just be based on personal preference? Also for the throat and divergent section why do you use separate edge sizing for the top and bottom?

[@AnsysTutor]

More smaller cells near the walls as the flow variation is more near the wall. Number of divisions depends upon you. If you want more cells you can use more divisions. More cells will take more time to solve with a better result.

[@hindm.mohammed3996]

I can't have more than 1 edge when ever i select it still one edge what should i do sir please helpe me

[@AnsysTutor]

You need to project the lines as shown in the tutorial. Without that the surface split is not possible.

[@hindm.mohammed3996]

@@AnsysTutor Thank you very much god pless you 🌷

[@AnsysTutor]

You are most welcome.

[@hindm.mohammed3996]

@@AnsysTutor if you don't mind sir My Dr. asked me an example as HW and i take this example do you have any problem ??

[@dhanishaswins1184]

Can someone tell me how to tilt the divergent part alone by 15°,keeping convergent part still.

[@AnsysTutor]

You can modify it in the sketch of the geometry.

[@dhanishaswins1184]

@@AnsysTutor In sketch how can I rotate the divergent part alone because it shows as 1 Part 1 body

[@AnsysTutor]

You want to bend the divergent section or change the angle of divergence?

[@dhanishaswins1184]

@@AnsysTutor I've to change the angle of divergent section alone by 10°,15°,20° for thrust Vectoring

[@juni172]

Hi, great video! Is there a reason you gave the nozzle exit a flat horizontal portion? Thank you

[@AnsysTutor]

No, there is no reason behind this. You can take the outlet shape as per your requirement.

[@Mr35diamonds]

You might even get ramp induced flow separation! since the flat portion is like a compression ramp!

[@dalisizwesibanda5690]

Hi, do you know why I could be getting an error about "poor mesh quality" when I try generate the mesh? I made sure the opposite edge of each surface had the same amount of divisions as you did. I tried restarting the model, but I still get the same error. I would really appreciate your help.

[@AnsysTutor]

have you select the 2D analysis option , is it in 2D or 3D workspace.

[@OblivionGuard]

@@AnsysTutor Can yoy please explain to me what you mean by that? How do i select the 2D analysis option?

[@yasserbicycle7734]

hello someone can help me on hight temperaature please?

[@AnsysTutor]

What are the initial conditions.

[@yasserbicycle7734]

@@AnsysTutor i have to simulate other 2d nozzle (dual bel nozzle) with Cp not constant value but fonction of température, and température will be Taken up to 1000 kelvin, do you have tutoriel of hight temperature please?! Would you contact me by mail please: [e-mail] !??

[@ianm1898]

hi,is it posible to face split the body that we import from other cad software? I tried to do, but I can't do that thank you

[@MAStephenWongTeckChing]

Hello sir, i try using bias mesh for inlet and oulte part. Then face meshing since the mesh is not good. Then it shows error. Really appreciate if you can help. Thank you

[@AnsysTutor]

Whats the error it shows.

[@MAStephenWongTeckChing]

@@AnsysTutor I already solve this problem sir. Thank you. But I still cannot get expecting result for simulation 😭. If you willing to help me i will explain it in detail for you sir.

[@AnsysTutor]

Yes, please explain about your problem. Mail us on [e-mail]

[@sruthisatheesh828]

Where did u get the dimensions?

[@AnsysTutor]

Its a random demonstration.

[@raffaelenapoli2012]

why you change the mesh behaviour from soft to hard ?

[@AnsysTutor]

It will suppress the default mesh sizes set by the software.

[@ubaidwrites]

sir which version are you using

[@AnsysTutor]

ANSYS R 19 has been used for this demonstration.

[@kartus831]

Music volume too loud

[@AnsysTutor]

😀 ha ha aaa haa, thanks

[@AnsysTutor]

will try to add some soothing music in our future videos.