<div dir="ltr">Barry,<br><br>Thank you very much!<br><br><br><br><div class="gmail_quote">On Mon, Aug 25, 2008 at 1:19 AM, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov">bsmith@mcs.anl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
You need to determine where the floating point exception occurs. On some computers<br>
this is easy, just run the code in the debugger and use the debugger option to trap floating<br>
point exceptions. Unfortunately this may not always be possible: in that case I would<br>
start with running with -info -snes_monitor -ksp_monitor to see what is happening before<br>
the floating point exception that is causing the difficulty.<br><font color="#888888">
<br>
Barry</font><div><div></div><div class="Wj3C7c"><br>
<br>
On Aug 24, 2008, at 7:18 AM, Shengyong wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br>
<br>
Does anyone happen to meet such convergency problem? I have implemented a petsc solver<br>
to simulate driven cavity flow problem. I use petsc to solve the poisson equation. When I set the space step<br>
dx = 1 or 0.01, it works fine. However, when i tried to simulate a meso scale problem, i set dx = 0.0001, dt = 0.00001.<br>
I got a error : floating point execption..<br>
<br>
Does anyone point me out how to solve this problem ?<br>
<br>
<br>
<br>
<br>
<br>
ong<br>
Solidification Simulation Lab,<br>
State Key Lab of Mould & Die Technology,<br>
Huazhong Univ. of Sci. & Tech. China<br>
</blockquote>
<br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Pang Shengyong<br>Solidification Simulation Lab, <br>State Key Lab of Mould & Die Technology,<br>Huazhong Univ. of Sci. & Tech. China<br>
</div>