[cysanghavi]

Hi all,
Application: Drill tool application. tool with an internal cooling channel.
Time when I start the Simulation: After the holes are drilled and the tool is at a certain high temp. (more than 600K).
My objective: to see the temperature Profile Variation with time on the drill tool surface. The surface seen below is after 10s.
Unbenannt.PNG.

Modeling strategy for the above results:
4 paths of heat loss considered:
1. Conduction into solid.
2. covection through the cooling channel.
3. convection to the outer Domain.
4. Radiation losses. which are Hand calculated analytical formulae developed and inserted as CEL condition.

conditions implemented:
1. Steady state Simulation with fixed temp. at this edge for 100 iterations.
2. Using this file as intial BC for my transient Simulation. applying BC on the surface for HTC (negative HTC applied for heat loss. I tried with positive also.)so that it loses heat to the surroudings.
3. convection at the Interface is modeled using Domain Interface condition where the heat Transfer condition in enabled.

I do not see reasons why the surface does not lose heat so fast. in 10s there is barely a Change of 2K. !


(Checks I did: I am using time steps small enough to satisfy Courant condition and the yplus value at the Interface is less than 11, GGI Domain Interface mesh Connection.)