Calculating Heat flux Absorbed in layer

[NatkamonPS]

Hello again, sorry for a naive question

Can I calculate the absorption in each layer of the receiver body by evaluating the Poynting flux difference between the top and bottom interface of that layer?

-------------- z0
emitter, T1
-------------- z1
Vacuum gap
-------------- z2
layer 1, T2
-------------- z3
layer 2, T2

if I set the emitter to be the source and probing line to be z2(or at vacuum gap), The calculated phi is the radiative exchange between the emitter and the whole layer1 and layer2, right? So, at z3 is between the emitter and the layer2. Then, the absorption in layer1 is ( (phi,z2)-(phi,z3) )*( Theta(w, T1) - Theta(w, T2) ). Is this correct?

Thank you,
Nat

[yigithanmehmetkose]

Hello, I think your reasoning is correct. Yet, when I do this, I get negative results. I think that might be related to the fact that I employ lossy metals as some of the layer materials. In the paper, there is a comment saying that using lossy metals might result in numerical instability. Do you have any conclusion on that?

[NatkamonPS]

Hello! I have been used/ validate this approach to calculate the absorption profile in different works ( for heat accumulation and input for other calculations) and it works well in my experience. That said, I have never found a negative result from this. But from my experience, as kfrancischen mentioned in another issue, upper bound of k affects a lot (especially for metal or materials supporting surface polaritons) and it may needs to be tuned.

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On Sat, 5 Apr 2568 BE at 20:55 Yigithan Mehmet Kose < ***@***.***> wrote: Hello, I think your reasoning is correct. Yet, when I do this, I get negative results. I think that might be related to the fact that I employ lossy metals as some of the layer materials. In the paper, there is a comment saying that using lossy metals might result in numerical instability. Do you have any conclusion on that? — Reply to this email directly, view it on GitHub <#4 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BDQM3FH7KFCESPNILN5A3WL2X7OGDAVCNFSM6AAAAABRKLJI5OVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOOBQG4ZTKNZSHE> . You are receiving this because you authored the thread.Message ID: ***@***.***> [image: yigithanmehmetkose]*yigithanmehmetkose* left a comment (kfrancischen/MESH#4) <#4 (comment)> Hello, I think your reasoning is correct. Yet, when I do this, I get negative results. I think that might be related to the fact that I employ lossy metals as some of the layer materials. In the paper, there is a comment saying that using lossy metals might result in numerical instability. Do you have any conclusion on that? — Reply to this email directly, view it on GitHub <#4 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BDQM3FH7KFCESPNILN5A3WL2X7OGDAVCNFSM6AAAAABRKLJI5OVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOOBQG4ZTKNZSHE> . You are receiving this because you authored the thread.Message ID: ***@***.***>