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Hot flow does not go cross the next domain.

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Old   November 15, 2020, 21:15
Default Hot flow does not go cross the next domain.
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Alfin Pohan
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Hello there.
I am simulating a cylinder that heated by hot air, my problem is that the flow seems like dont go to the cylinder itself. I have 2 domains both defined as fluids i callled the cylinder as a drum. The flow seem does not hit the drum, but when i set the contour around the interface around the drum it is just stop there but does not influence the temperature of the drum. Is there anybody can help me figure it out?
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Old   November 16, 2020, 08:53
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It seems that your two domains are not properly connected. What is the type of the boundary between them? It has to be interior.
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Old   November 26, 2020, 03:22
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Originally Posted by MKuhn View Post
It seems that your two domains are not properly connected. What is the type of the boundary between them? It has to be interior.
I am terribly sorry for replying this too latee. Btw its interface but i supressed the contact region between it and i got 1 boundary in the drum then i set it as a wall.
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Old   November 26, 2020, 04:42
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So you replaced the interface by a wall, and now you ask why you see a wall in your results?
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Old   November 26, 2020, 05:02
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Originally Posted by pakk View Post
So you replaced the interface by a wall, and now you ask why you see a wall in your results?
Sorry sir but the hot air dont heat the wall. It does not even hit it. Like theres no continutiy around it
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Old   November 26, 2020, 19:42
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you need to have interior or coupled interface boundary condition between fluid regions
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Old   November 28, 2020, 04:28
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Sorry sir but the hot air dont heat the wall. It does not even hit it. Like theres no continutiy around it
Yes, that is what isolating walls do... You told Fluent to block all mass and heat. Don't do that.
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Old   November 28, 2020, 05:54
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I was trying si hard to make it ad interior sir, btw i am a newbie.
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Old   November 28, 2020, 09:30
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I am not making fun of you. I'm trying to show you that Fluent just followed your instructions.

Don't feel attacked because somebody answered your question.
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Old   November 28, 2020, 10:09
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Originally Posted by pakk View Post
I am not making fun of you. I'm trying to show you that Fluent just followed your instructions.

Don't feel attacked because somebody answered your question.
I dont feel attacked or being tricked sir, i was asking the real question. I was form new part for my geometry and now i am able to set it as interior. Just same as when i supressed the contact region, i defined the surface one by one in order to get those interiors. When i tried the supress method i got the same problem, the fluents dont hit the drum as well, still finding a way to solve this problem without a conformal mesh.

I admited that i am a newbie. Sorry if i made some mistake that offend you.
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Old   November 28, 2020, 21:44
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I don't know why you react like this. Nothing offended me, I never said something offended me, I never hinted that something offended me, I only tried to help you with your question.

But if you keep repeating that you are a newbie and suggest that I am being bad to newbies: that is a good way to offend me.
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Old   November 28, 2020, 23:11
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Originally Posted by pakk View Post
I don't know why you react like this. Nothing offended me, I never said something offended me, I never hinted that something offended me, I only tried to help you with your question.

But if you keep repeating that you are a newbie and suggest that I am being bad to newbies: that is a good way to offend me.
All right, then we are fine here.
Do you have some suggestion like what should i do now sir about my simulation? I need that so bad. Thank you.
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Old   November 29, 2020, 04:43
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Originally Posted by Alfinmp View Post
Btw its interface but i supressed the contact region between it and i got 1 boundary in the drum then i set it as a wall.
This is what caused the problems. You suppressed the interface and made it a wall. Don't do that!

Now you probably did.that for a reason. I don't know the reason, I can't look inside your head. I can only guess.

My guess is that the interface gave you errors, and you did this to solve the error. If that is true, then this is the wrong approach. (but don't feel bad for trying!) The error should be fixed in another way. But I need more info on WHY you did this, before I am able to say how it can be solved.
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Old   November 29, 2020, 04:59
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Originally Posted by pakk View Post
This is what caused the problems. You suppressed the interface and made it a wall. Don't do that!

Now you probably did.that for a reason. I don't know the reason, I can't look inside your head. I can only guess.

My guess is that the interface gave you errors, and you did this to solve the error. If that is true, then this is the wrong approach. (but don't feel bad for trying!) The error should be fixed in another way. But I need more info on WHY you did this, before I am able to say how it can be solved.
I supressed the contacts cause i am not able to get a wall for the drum, but when i realized when i supressed it i had to attach it one by one and the problem still occured, i realized that is not solving my problem. As you can see on this screenshot.

The flow i defined from the pipe was not go out to the outlet, it just hit the drum and dissappeared.
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Old   November 29, 2020, 05:53
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Originally Posted by Alfinmp View Post
I supressed the contacts cause i am not able to get a wall for the drum, but when i realized when i supressed it i had to attach it one by one and the problem still occured, i realized that is not solving my problem. As you can see on this screenshot.

The flow i defined from the pipe was not go out to the outlet, it just hit the drum and dissappeared.
Slow down, you are going too fast...
So your first problem was that you were not able to get a wall for the drum. Start with that.
First of all: I don't understand this. The wall is the default boundary, how were you not able to get this? What did you get instead, an inlet? An outlet? What makes you say that you did not get a wall? And what does this wall for the drum have to do with the interface between the drum and the cylinder?
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Old   November 29, 2020, 06:00
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I only got two interfaces sir, they are interfaces for drum and also the housing domain. I could not be able to swith it as a wall. But when i deleted a mesh connection in ansys fluent that attaching both interfaces once i was able to set it as a wall, it said the interface unassigned.
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Old   November 29, 2020, 11:19
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No no, don't change the interface into a wall!

Why are you trying to make the interface a wall? Stop that!

Do you know what an interface is? Do you know what a wall is? Are you sure you are using the term "interface" correctly? Because I can't make any sense of why you think this is a good idea.
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Old   November 29, 2020, 11:21
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Quote:
Originally Posted by pakk View Post
No no, don't change the interface into a wall!

Why are you trying to make the interface a wall? Stop that!

Do you know what an interface is? Do you know what a wall is? Are you sure you are using the term "interface" correctly? Because I can't make any sense of why you think this is a good idea.
Okay, i wont do that. I have read what the interior and wall are. By the way i want the drum as a wall, i cant figure it out sir.
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Old   November 29, 2020, 11:25
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Load your model, and look at the cell zones.

You probably have:
-interiors (at least two in your case)
-interfaces (at least two)
-walls (at least two)

Is that right?
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Old   November 29, 2020, 11:28
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Quote:
Originally Posted by pakk View Post
Load your model, and look at the cell zones.

You probably have:
-interiors (at least two in your case)
-interfaces (at least two)
-walls (at least two)

Is that right?
Yes thats right.
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