ICEM CFX - Mutiple domains – Electric Arc Simulation
 

Hey,
I would like to simulate an electric Arc with CFX. For this purpose I created a simply geometry with two solid spheres inside a cylinder for the fluid with ICEM.
The solid spheres are generated and meshed separately. For the fluid domain I created a cylinder with also two spheres, so that I can create an interface for the three domains. You can check the attached pictures. I created for a blocking for the cylinder and excluded the surfaces of the spheres. (I hope so by choosing for the parts to block the cylinder and the spheres’ surfaces) Then I created another blocking for each sphere. (Still for the fluid domain) Afterwards I meshed the geometry and merged the three meshes of the solid spheres and the fluid domain.
If I want to simulate the Arc with CFX, I get the error that there are three isolated domains in the fluid domain. I ensured that there is connectivity between the surfaces of each region und created interfaces for the solid-fluid region.
Then I just simulated the fluid domain without the solid domains (I took the fluid region and didn’t merged them with the solid spheres) and got the same error.
Here’s the error:
[...]
+--------------------------------------------------------------------+
| Checking for Isolated Fluid Regions |
+--------------------------------------------------------------------+
3 isolated fluid regions were found in domain Fluid Domain
[...]


I expect the fault in the participation of the three regions in the fluid domain. My motivation behind this approach was to ensure that only the fluid region will be meshed and that I can create an interface for the solid to fluid surface.

Can you please help me to find a solution to solve this problem? If you have any further questions, feel free to ask. ;)
Kind regards
Lukas

Solution
 

Hey,

I am happy to announce that I found a solution by myself. It was unnecessary to create blocks for the two spheres in the Fluid Domain. Instead I created one block and cut out the spheres. Then it was possible to mesh only the fluid domain and merge the meshes.

Kind regards
Lukas

electrical arc
 

hello sir, and sorry for you bother but please please i need your help because i have not found enough detail.
as you see:
- I have my geometry (anode / cathode declared as solid, and the cylinder is the chamber of the electric arc declared as fluid).
- I activated the MHD module for my simulation, then I checked "petentiel electrique".
- is the method right? or should you use maxwell module too?
my problem, I do not know how applied the condition to the limit (I have a difference of gallows = 48V when separating the electrodes).
I note that I have a simulation of an electrical arc.
Thank you and good day

- I have my geometry (anode / cathode declared as solid, and the cylinder is the chamber of the electric arc declared as fluid)
-> Good. I can't judge your mesh this way.

- I activated the MHD module for my simulation, then I checked "petentiel electrique".
-> Good

- is the method right? or should you use maxwell module too?
-> Yes, Yes


my problem, I do not know how applied the condition to the limit (I have a difference of gallows = 48V when separating the electrodes)
-> Setting boundaries is basic. Please check some tutorials. If you have checked all electrical modules and have them activated for every part, you should be able to set your boundary conditions.


-I note that I have a simulation of an electrical arc.
-> I am curious, what Ansys program do you use on this screenshot? Ansys CFX?


After all, what is your specific question?

Hello sir,

thank you for your answer.

I use ansys CFX and fluent (file attached).

for my question it's just to confirm the simulation method because I prepare my master .

Thank you and good day

Hello sir, and i'm sorry for the trouble i'm giving to you , but I would like you to validate the steps of my simulation (maxwell), because I am a beginner and I am a basic mechanic. the details is attached.