<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">Hello All,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">I was trying to configure PETSc with SUNDIALS so that I may use PVODE to solve a stiff hyperbolic PDE of the form</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">A(x) u_tt = K [B(x) u_x - F(x, u, u_x, t)]_x , t > 0, 0 < x < L ,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">u_x(0, t) = u_x(L, t) = 0 ,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">u(x, 0) = u_t(x, 0) = 0 ,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">where K >> 1. I was reading around to see what may be a good numerical implementation for such a problem and it can be tricky here because the stiffness is both in the linear part and the nonlinear forcing term. </div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(11,83,148)">I want to try PVODE availble in the SUNDIALS package. When I try to configure PETSc with SUNDIALS, I get the message:</div><div class="gmail_default" style="color:rgb(11,83,148)">
<p class="" style="font-family:verdana,sans-serif">Downloaded sundials could not be used. Please check install in /Users/namupatel/Softwares/PETSc/3.6.2/linux-dbg</p>
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<p class=""><font face="monospace, monospace"> File "./config/configure.py", line 363, in petsc_configure</font></p>
<p class=""><font face="monospace, monospace"> framework.configure(out = sys.stdout)</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/framework.py", line 1081, in configure</font></p>
<p class=""><font face="monospace, monospace"> self.processChildren()</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/framework.py", line 1070, in processChildren</font></p>
<p class=""><font face="monospace, monospace"> self.serialEvaluation(self.childGraph)</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/framework.py", line 1051, in serialEvaluation</font></p>
<p class=""><font face="monospace, monospace"> child.configure()</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/package.py", line 677, in configure</font></p>
<p class=""><font face="monospace, monospace"> self.executeTest(self.configureLibrary)</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/base.py", line 126, in executeTest</font></p>
<p class=""><font face="monospace, monospace"> ret = test(*args,**kargs)</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/package.py", line 592, in configureLibrary</font></p>
<p class=""><font face="monospace, monospace"> for location, directory, lib, incl in self.generateGuesses():</font></p>
<p class=""><font face="monospace, monospace"> File "/Users/namupatel/Softwares/PETSc/3.6.2/config/BuildSystem/config/package.py", line 332, in generateGuesses</font></p>
<p class=""><font face="monospace, monospace"> raise RuntimeError('Downloaded '+self.package+' could not be used. Please check install in '+d+'\n')</font></p><p class="" style="font-family:verdana,sans-serif">Two questions:</p><p class="" style="font-family:verdana,sans-serif">1. How can I resolve the above error? </p><p class="" style="font-family:verdana,sans-serif">2. Are there any recommendations to solving the stiff PDE stated above so that I can experiment to see what may be an efficient implementation?</p><p class="" style="font-family:verdana,sans-serif">Thank you,</p><p class="" style="font-family:verdana,sans-serif">Namu</p><p class="" style="font-family:verdana,sans-serif"><br></p></div></div>