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# Questions tagged [heat-transfer]

For questions about modeling heat transfer, often through the use of heat (differential) equation.

12 questions with no upvoted or accepted answers
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### Prediction of sphere (i.e. roast) core temperature heated in an oven

The real-life problem Assume I put a spherical roast with initially constant temperature of start_temp=25 (°C) into an oven with ...
95 views

### Correct approach for thermal finite element simulation of layered assembly

I would like to optimise the heat transfer on a PCB. Several dies are on the top and cooling air is going through the fins in heat sink on the bottom. The assembly consists of several layers like ...
85 views

### Conceptual doubt regarding 2D conjugate heat transfer modelling (COMSOL and Mathemtica)

I have been dealing with some conceptual flaws in my understanding of modelling, which I will elaborate herein. I am modelling conjugate heat transfer of a reciprocating fluid, which flows with ...
77 views

### How to accelerate the computing of implicit finite difference method for heat conduction between two solids

Edit on May 3rd: I have found the problem. Because the difference of between $k_1$ and $k_2$ is huge, a very small time step need to be chosen so that the right green part can "feel" the ...
84 views

### Rosenthal equation for multi track

Rosenthal's equation lets one calculate the temperature profile of a moving point heat source analytically for thin and thick plates. For simplicity I use the equation for thick plates defined as: T-...
1 vote
77 views

1 vote
796 views

### Methods and tools to solve the two-temperature model (TTM)

I would like to model heat diffusion at the gold / water interface after excitation of the metal surface by an ultrafast laser pulse (ca. 80 fs). An appropriate model to start with would be the "two ...
1 vote
177 views

### BTCS-like method for heat conduction in unstructured triangular grid

I want to write a simple simulation for heat conduction in a unstructured triangular mesh. I already made it work for a structured rectangular grid with the ADI method, but now I need more complex ...
37 views

### What is the boundary condition of $\varepsilon$ for $k-\varepsilon$ turbulence model?

I'm working on the numerical solution of systems of equations, you can use this link to access it, the system of equations is \$\begin{aligned} \partial_t \theta+u \nabla \theta-\nabla \cdot\left(\...