[MrStuebb]

Hello,

I´m trying to simulate nucleate boiling of an ammonia-water-mixture by fluent 6.3. in a pipe with turbulent flow and eulerian multiphase model. Therefor I´m using the udf of the "Nucleate Boiling"-Tutorial by Fluent. For this udf I defined two boundary conditions for the interior wall, one for the solid side (wall) and one for the fluid side (wall-shadow). The mesh on the fluid side got a very fine boundary layer.

My Problem:
The solution doesn´t show any heat transfer between wall and fluid. I´m sure that material data, entered in fluent and udf, are correct because I tried to iterate the tutorial data with original udf on my mesh in the same way the tutorial do. But no heat transfer occurs.

If there is someone with an idea for solving my problem I´m thankful for telling me.

best regards

mrstuebb

[deep_seak]

Hi. I am also trying to simulate the same tutorial case and having the same problem. I even tried to model the same geometry as the tutorial's one and also import the original mesh file in gambit and then exported it again and run the solution. But in all the above cases no heat transfer occured. If you find any answer then please send me at deep_seak@yahoo.com

[MrStuebb]

Hello,

late, but better than never

try to change the wall-shadow and wall-shadow-shadow boundaries of the pipe wall with each other. When I remind correct, it was the failure in my case.

[hamdy]

Sorry, but i have similar problem. Could you plz send me the boiling tutorial on my mail: hamdy.abotaleb@yahoo.com

Thanks

[majidsa6]

hi my friend,

if u send for me your udf code i can help u

because i should run it in fluent and i answer to u for your error

[Ghalebsater]

Hello guyz, Is there a UDF for 3d or the given 2d udf from the tutorials will work on any 3d model. Any idea??

[raoudha]

Originally Posted by MrStuebb

Hello,

I´m trying to simulate nucleate boiling of an ammonia-water-mixture by fluent 6.3. in a pipe with turbulent flow and eulerian multiphase model. Therefor I´m using the udf of the "Nucleate Boiling"-Tutorial by Fluent. For this udf I defined two boundary conditions for the interior wall, one for the solid side (wall) and one for the fluid side (wall-shadow). The mesh on the fluid side got a very fine boundary layer.

My Problem:
The solution doesn´t show any heat transfer between wall and fluid. I´m sure that material data, entered in fluent and udf, are correct because I tried to iterate the tutorial data with original udf on my mesh in the same way the tutorial do. But no heat transfer occurs.

If there is someone with an idea for solving my problem I´m thankful for telling me.

best regards

mrstuebb

hello mrstuebb

I´m also trying to simulate two phase flow of an ammonia-water-mixture by fluent in vertical tubes, my problem is how to define the materiel properties of water-ammonia mixture, could you help pleaaaase

thank a lot
raoudha

[MrStuebb]

Hi,

as far as I can remember we calculated the material properties according to the volume rates of water and ammonia in the mixture and entered it as one phase into FLUENT. In FLUENT you have the possibility to determine the material properties as a function of temperature.

The properties of vaporization of the mixture were determined in a UDF-function, related to the temperature and pressure of the mixture.

I hope I this will help you!

[raoudha]

thank you very much i'll try this, hope it works
best regards

[raoudha]

dear MrStuebb

i'm still trying to write the UDF for ammonia-water mixture properties, could you pleaaaaaaaaaaase help me with en example cause it's the first time i deal with UDfs and it seems a little complicated, would you help pleaaase, my mail is " garma_raoudha@yahoo.fr "

with lot of thank

[ahmedalneama]

Sorry, but i have similar problem. Could you please send me the boiling tutorial on my mail: ahmad_alniema@yahoo.com

Thanks

[jigneshrohit99]

can anyone provide me tutorial of nucleate boiling of in horizontal pipe?

can anyone tell me where to download fluent tutorials pdf and zip files?

[Rag]

Hi guys,

I am also trying to simulate Nucleate boiling using ANSYS in a 3D model.
I am using Eulerian 2 phase flow model with RPI boiling implicit.

But while running the calculations, it is showing 'Floating point exception' error.
What it mean?
Has Any one have the tutorials?
is there any UDF should be included?

Please, Anyone here!!
I need your Help!!

Thanks in advance.