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<div class="gmail_quote">MATNEST is only a storage optimization
after everything works right. It does
<div>not have to do with solving.</div>
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Thanks for the answer. I hoped that I could use block solvers suited
for MATNEST, which apparently work for a variable-sized block
matrix. To the extend of my knowledge, MatCreateBAIJ only accepts
constant block sizes. <br>
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Something is very wrong there. I advise you to also try
SuperLU and MUMPS.<br>
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I will try to compile them on windows, and report the result here.<br>
<br>
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<div>Iterative methods depend sensitively on the equation, as
opposed to direct</div>
<div>solvers which almost do not care. The first step in
designing an iterative solver</div>
<div>that PETSc can implement is to find in the literature
where one has worked for</div>
<div>your problem.</div>
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What I'm trying to solve here, has never been studied before
(compositional fractured petroleum reservoir simulation+coupled
phase equilibrium formulation+diffusion mass transfer), therefore I
can not seek help from the literature.<br>
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Best wishes,<br>
Ali<br>
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