Learning Forum

[Ezequiel Bravo Jacinto]

Hey there everybody,

 

Having problems with my fluent settings regarding the residuals values.

 

The work in a resume way is to transfer and experimental analysis to ansys for a Close Loop Heatpipe made of Silicon with Ethanol as a working fluid, this done in a transient time with VoF activated with only 2 phases Liquid-Vapour with condensation-evaporation mass transfer. all materials are user input as they are not in the ansys data bench, i´m looking for problems but there aren´t any when comparing it to other transient works i have done with heatpipes.

 

Can someone please help or relate this problem? is this maybe because of the new fluids and solid materials data?

 

[Rob]

How did you initialise the model? The other residuals are showing as zero. Can you post an image of the phase volume fraction. I know a couple of reasons for this to happen, but need images to keep me on the right side of the Export rules (don't ask). 

[Ezequiel Bravo Jacinto]

Here let me post the pictures:

 

The initialization is as always the same with a total 20,000 timstep with a 0.0005 jump. 

 

 

Most of the materials i used are user input, the problem is that some of my colleges say that maybe that´s the problem, but the thing is that all those materials have the required properties asked by ansys fluent:

 

 

These are the values i´m using

 

[Rob]

Can you show what the cell zones are? Also, why do you have nonconformal interfaces? 

[Ezequiel Bravo Jacinto]

Already found what the problem was.

 

It looks like in ansys fluent when you try to export from the geometry component system to a geometry and mesh component system to a Fluent component system, there´s this problem that the calculation aren´t done correctly.

Found this after doing just the geomtry component and the complete Fluent analysis system let me do the calculations with no problem regarding the residuals.

 

And finally responding to you question of why i have nonconformal interfaces, si to be able to simulate the tree sections that conforms a Heatpipe: Evaporator, condenser and adiabatic section, so my geometry needs to be slice in 3 section and take all the individuals solids together into a part so the analysis over those sections are closer to the experimental analysis done in the close loop heatpipe.