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Regarding choosing correct boundary condition

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Rahul
Rahul 2024-6-21
评论： Rahul 2024-6-21
Hi,
I have a condition where at the left boundary and the right boundary I need the flux to be non-zero.
Thus, the equations
pL + qL*fL = 0 and pr + qr*fr = 0 are such that fL and fr being non zero is making my equation hard to determine the values for pl, ql as well as pr, qr.
Plz tell me how should I approach for the same.
with regards,
rc

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Torsten
Torsten 2024-6-21
编辑：Torsten 2024-6-21
If you set qL = 1 and qr = 1 and you defined f as f = D*du/dx in the function where you need to specify [c,f,s], you can specify the flux in pL and pr.
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Torsten
Torsten 2024-6-21
编辑：Torsten 2024-6-21
What is u(2) ? Is it n ?
The flux for u(4) should not include pi_s.
Put 1/r d/dr(r*n*pi_s) in the source term s(4) and remove it in the specification of f(4).
Rahul
Rahul 2024-6-21
Hi, Torsten,
Yes, u(2) is n.
Ok, I'll do so. Thanks a lot.
rgds,
rc

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