We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum Forums Discuss Simulation General Mechanical Help needed for steady state thermal analysis of rectangular fins and validation Reply To: Help needed for steady state thermal analysis of rectangular fins and validation

tirth.a2021
Subscriber

Thanks for the suggestion. Yes, you are correct, I had only used the formula for long fin. So what I did was, instead of declaring convection for both the surface of the engine block as well as the surface of the fin, I declared them seperately, and added a reaction probe result to get the heat flow from fins alone. Coupled with that I calculated fin tip temperature and heat flow for all 3 types of fins (long fin, short fin with insulated end, and short fin with end not insulated) as provided in the databook, with results as shown below:

Based on above values, I find that "short fin, end not insulated" has values closest to ANSYS results, so I'm going to go forward with that.

 

Just one other query: Here's a similar engine block but with triangular fins:

Here, I'm planning to use the same formulas for verification. But I need to know how to find the value of cross-sectional area and perimeter of the cross-section to input in the formula, since unlike rectangular fins, the cross-section changes along the fin here. Appreciate the help!