I have a 3d structure comprised of multiple layers. An inner-middle layer exerts a heat flux of 650 W/m^2.
The whole "box" is in an enclosure of air with an inlet velocity.
I want to see how the box is cooled.
My steps:
Geometry: Created a cavity in the enclosure exact to the dimensions of the "box".
Mesh: Inserted inflation layers to the cavity.
Fluent:
*Steady state
*Energy: On
*Model: SST
*Bodies been assigned to solid/fluid
*Created interfaces between geometries that are in touch.
*Insert 650 heat flux at the interface side of the middle layer.
*All other walls from interfaces are either COUPLED or have checked the "via system COUPLING" option.
*Applied Monitors: Facet Average of Static or Wall Temperatures.
My residuals are fine. However, the energy readings quickly skyrocket from e-15 to e+01 and then just fluctuate forever. At the same instant my temperatures skyrocket from 300K to 5000K !
What do I do ? Should I change HEAT FLUX -->HEAT GENERATION ?
For the interfaced walls, should I check "convention" instead of "via system coupling" ? Should I insert heat transfer coefficient ? How do you get that number ?
Christos,
I believe you can get more accuracy from transient simulations.
In steady state simulations many of the cross terms, higher order terms & non-linearities dealing with time are neglected.
Good luck.
Mounir Bouaifi,
Thank you, I will be doing a brief transient simulation later.
My issues lie mostly with the settings of Fluent.
dear sir please did you find where the issue was??
and thank you
@ Christos Andrea Christou
- Badges
- Science topic