Thermal Analysis of a simple CAD file (.stl)

Question

Erdal Schranz 2018-5-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/401498-thermal-analysis-of-a-simple-cad-file-stl

评论： Fionn Mc Evoy 2024-1-22

CombineCubes_PDE-ThermalAnalysis.zip

Dear,

I try to make a simple thermal analysis in Partial Differential Equation Toolbox. I have combine two cubes with different length in a CAD software and have export it to the format .stl . Here is the picture of the two combine cubes:

After that I mesh the model and set the temperature at Face 5 (F5) to 90°C and Face 12 (F12) to 20°C. Here is the temperature distribution. It looks like that the two cubes are not combined. What can I do that the two cubes are connected and we have a heat flow between them? In the attachment you will find the necessary files.

Thank you very much for your help. Best regards Erdal

thermalmodel = createpde('thermal','steadystate');
importGeometry(thermalmodel,'CombineCubes.stl');
pdegplot(thermalmodel, 'FaceAlpha',0.5,'FaceLabels','on','CellLabels','on')
mesh=generateMesh(thermalmodel)
pdemesh(thermalmodel);
T1 =90;
T2 = 20;
thermalProperties(thermalmodel,'cell',1,'ThermalConductivity',0.15);
thermalProperties(thermalmodel,'cell',2,'ThermalConductivity',0.3);
thermalBC(thermalmodel,'Face',5,'Temperature',T1); %Temperature upside
thermalBC(thermalmodel,'Face',12,'Temperature',T2); %Temperature downside
results = solve(thermalmodel);
pdeplot3D(thermalmodel,'ColorMapData',results.Temperature)
caxis([0 100])

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Ravi Kumar 2018-5-21

Hi Erdal,

Is it correct to say you want to define different thermal conductivity for each block?

What version of MATLAB are you using?

I can suggest a workflow depending on your MATLAB version.

Regards, Ravi

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Answer 1

Erdal Schranz 2018-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/401498-thermal-analysis-of-a-simple-cad-file-stl#answer_321392

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Dear Ravi, thank you for your answer. I can define different thermal conductivity for each block, see in my code above

 if true 
thermalProperties(thermalmodel,'cell',1,'ThermalConductivity',0.15);  
  thermalProperties(thermalmodel,'cell',2,'ThermalConductivity',0.3);
  end

The problem is that the two blocks are not thermally connected. You can see that cause both cubes have a uniform temperature distribution. There should be a heat flow from Cube 1 to Cube 2 and therefore the temperature should not be uniform distributed. Does anybody know how to get a thermal connection between this two cubes?

Thank you

Best regards Erdal