<div dir="ltr"><div dir="ltr">On Thu, Apr 20, 2023 at 11:07 AM Edoardo alinovi <<a href="mailto:edoardo.alinovi@gmail.com">edoardo.alinovi@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi Matt, <div dir="auto"><br></div><div dir="auto">thanks for sharing the literature. </div><div dir="auto"><br></div><div dir="auto">Would you suggest any monolitic approach for the mpiaij/mpibaij matrix instead of fieldsplit?</div></div></blockquote><div><br></div><div>I have not seen them be better, but Vanka-type smoothers can work for this system.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div dir="auto">I did some blind search using gamg/hypre and they look terribile. I guess i am missing a trick, probaly they are not the way to go?</div></div></blockquote><div><br></div><div>I believe that trick is that the patches you use have to very specific.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div dir="auto">Thanks!</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il Lun 17 Apr 2023, 13:50 Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">On Mon, Apr 17, 2023 at 6:37 AM Edoardo alinovi <<a href="mailto:edoardo.alinovi@gmail.com" rel="noreferrer" target="_blank">edoardo.alinovi@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Sure thing, the solver I am working on is this one: <a href="https://gitlab.com/alie89/flubio-code-fvm" rel="noreferrer" target="_blank">https://gitlab.com/alie89/flubio-code-fvm</a>.<div><br><div>It is a 3D, collocated, unstructured, finite volume solver for incompressibility NS. I can run steady, unsteady and I can use SIMPLE, PISO and Factional step method (both explicit and fully implicit momentum). I can also solve for turbulence (k-omega, BSL, SST, Spalart-Allmars, LES). I have also implemented some kind of Immersed boundary (2D/3D) that I need to resume at some point. </div><div><br></div><div>Hot topic of the moment, I am developing a fully coupled pressure based solver using field-split. What I have now is working ok, I have validated it on a lot of 2D problems and going on with 3D right now. If all the tests are passed, I'll focus on tuning the field splitting which looks to be a quite interesting topic! </div></div></div></blockquote><div><br></div><div>I think a very good discussion of the issues from the point of view of FEM is</div><div><br></div><div> <a href="https://arxiv.org/abs/1810.03315" rel="noreferrer" target="_blank">https://arxiv.org/abs/1810.03315</a><br></div><div><br></div><div>There should be a similar analysis from the FVM side, although it might not be possible to</div><div>find a pressure discretization compatible with the FVM velocity for this purpose.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><div>Flubio is a project I have been carrying on since PhD days. The implementation is 99% on my shoulders, despite the fact I am collaborating with some people around. I am coding evenings and weekends/free time, it gives me a lot of satisfaction and also a lot of insights! </div></div></div></div></blockquote></div><div><br></div><span>-- </span><br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" rel="noreferrer" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>