<div>Well,</div>
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<div>I am simulating unsteady flow past a moving airfoil at Re~10^4. I'm using fractional step FVM, which means that I need to solve a momentum and poisson equation. </div>
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<div>To reach a periodic state takes quite a few hours and so I'm trying to find ways to speed up the process. I thought parallelizing the code would help but it seems like it's not the case.</div>
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<div>I'm now trying out different types of solver/preconditioner available on PETSc to assess their performance. Is there other external solvers, which PETSc interfaces, which are recommended? I'm thinking of using multigrid to solve the poisson eqn... wonder if hypre/BoomerAMG etc would help...
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<div><span class="gmail_quote">On 2/11/07, <b class="gmail_sendername">Lisandro Dalcin</b> <<a href="mailto:dalcinl@gmail.com">dalcinl@gmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On 2/10/07, Ben Tay <<a href="mailto:zonexo@gmail.com">zonexo@gmail.com</a>> wrote:<br>> In other words, for my CFD code, it is not possible to parallelize it
<br>> effectively because the problem is too small?<br>><br>> Is these true for all parallel solver, or just PETSc? I was hoping to reduce<br>> the runtime since mine is an unsteady problem which requires many steps to
<br>> reach a periodic state and it takes many hours to reach it.<br><br>Can you describe your specific application and how are you solving it?<br>As Barry said, your need-for-speed is not likely to be solved by<br>running in parallel.
<br><br><br>--<br>Lisandro Dalcín<br>---------------<br>Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)<br>Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)<br>Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
<br>PTLC - Güemes 3450, (3000) Santa Fe, Argentina<br>Tel/Fax: +54-(0)342-451.1594<br><br></blockquote></div><br>