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Forum: CFX October 25, 2017, 07:32
Replies: 12
Views: 1,243
Posted By fabfi
Got a solution, at least for the next steps. I...

Got a solution, at least for the next steps. I stop Mass and Momentum transfer over the interface from water to air and allow only thermal interface flux. Thus, it behaves like a wall.

Actually, I...
Forum: CFX October 25, 2017, 01:32
Replies: 12
Views: 1,243
Posted By fabfi
Nope. The warm zone is just a tiny part of the...

Nope. The warm zone is just a tiny part of the real volume. I only look at a small detail of the construction. Sure, I could make it bigger but I guess the problem would still persist.
Forum: CFX October 24, 2017, 11:19
Replies: 12
Views: 1,243
Posted By fabfi
In the picture you can see a thin layer of hot...

In the picture you can see a thin layer of hot water at the bottom and at the right wall. Still a little colder water stratifies above because it heats up too slow.

Dont be confused by the...
Forum: CFX October 24, 2017, 11:12
Replies: 12
Views: 1,243
Posted By fabfi
--> I try to keep the temperature in the hot zone...

--> I try to keep the temperature in the hot zone constant by having a hot backflow into the domain when cold water leaves it.

I am open for other ideas. I could also make the hot volume veeery...
Forum: CFX October 24, 2017, 11:05
Replies: 12
Views: 1,243
Posted By fabfi
Yep tried that as well. But only helped a little....

Yep tried that as well. But only helped a little. In the end I had stratified water in the big volume (hot water has 98C and cold has 20C). Maybe I could define a wall heat flux depending on the...
Forum: CFX October 24, 2017, 10:55
Replies: 12
Views: 1,243
Posted By fabfi
Maybe the picture helps to understand the...

Maybe the picture helps to understand the problem. Displayed is the volume fraction of water. Over time it gets much worse.
Forum: CFX October 24, 2017, 10:53
Replies: 12
Views: 1,243
Posted By fabfi
BOUNDARY: Opening Boundary Type =...

BOUNDARY: Opening
Boundary Type = OPENING
Interface Boundary = Off
Location = F1049.1034
BOUNDARY CONDITIONS:
FLOW DIRECTION:
Option = Normal...
Forum: CFX October 24, 2017, 10:52
Replies: 12
Views: 1,243
Posted By fabfi
buoyancy Multiphase with Opening

Dear all,

I got trouble with a transient multiphase case (continueous domains). It includes

- air (top)
- cold water (middle) separated through a narrow gap from
- hot water (bottom)

air...
Showing results 1 to 8 of 8

 
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