Strange Residual Plot
 

Hello Every Body
I am trying to model the fluid flow and heat transfer of a nanofluid flow in a straight pipe available in "Experimental investigation of convective heat transfer of Al2O3/water nanofluid in circular tube" By S. Zeinali Heris, M. Nasr Esfahany, S.Gh. Etemad.
While running the calculation on Ansys Fluent 14.0 strange residuals come up.
I have attached the residuals plot and the modelling summary.
It would be my pleasure if you guide me through.

With which eulerian approach are you working?

Thank you for your reply.
I am working with Eulerian approach

Okay Nice: Question

-Interphase momemuntum transfer and heat transfer Modelling
-REference DEnsity if gravity is enabled
-Diameter of the dispersed Phase
-Segregated or Coupled or Fully Coupled
-The nature of the Problem: we can not look and seek the paper? Is it a duct flow where the bottom is set with heat flux

Drag : schiller-naumann
Cillisions:0.9
Heat: ranz-marshall
Diameter : 20nm
Phase Coupled Simple
a duct with constant temperature as wall boundary condition.
article link

that sounds great with the domain specifications.. Do you have a Contact ID to mail it to the ansys Support...

What about the descritisation of the void, energy and momentum.

Did you give you the right material properties?

Water and the other phase do not undergo phase change right? Only heat tranfer between the phases assuming the temperature of the dispersed phase to be constant at the staturation point.

How is big the void fraction of the disersed phase and the particle loading? Did you calculate the stokes number