# Transient heat flux boundary condition in PDE toolbox

조회 수: 27(최근 30일)
mathru 2020년 9월 30일
댓글: Ravi Kumar 2020년 10월 1일
Hi,
I am modelling temperature distribution of a circular cylindrical rod with a plate. The model is very much similar to (https://au.mathworks.com/help/pde/ug/heat-distribution-in-a-circular-cylindrical-rod.html) model. In my model, I am using heat flux boundary condition at the edge 2 (interface of rod and plate) which is varying with time. I have set 298 K as atmospheric temperature and 910 K as initial temperature. It is expected that heat flux will be zero when the edge temperature will reach at atmospheric temperature. I have set the boundary condition as given in the following code. The results do not seem correct because the edge temperature reaches steady state at time t=1s for all initial temperatures (T_0 = 510K and 910K).
How can I solve the problem?
k = 1.3913; %Thermal conductivity [W/(mK)]
h_thick = 0.001; %Thickness of the plate [m]
T_amb = 298; %Atmospheric temperature [K]
T_0 = 910; %Initial temperature [K]
thermalBC(thermalModelT,'Edge',2,'HeatFlux',@(location,state) (T_surr-state.u)*k/h_thick);

댓글을 달려면 로그인하십시오.

### 채택된 답변

Ravi Kumar 2020년 9월 30일
Based on what you describe, it appears you are assigning heat flux on an interior edge. These are not boundaries of the domain so they won't be processed. Refer to https://www.mathworks.com/help/pde/ug/do-not-specify-boundary-conditions-between-subdomains.html
##### 댓글 수: 4표시숨기기 이전 댓글 수: 3
Ravi Kumar 2020년 10월 1일
Since you are assiging this function to Edge 2, state.u that solve constructs only contains values asssociated with Edge 2.

댓글을 달려면 로그인하십시오.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by