<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Dear DUNE developers,</p>
<p>as you may know, we are using DUNE to run FEM with the sparse
grid combination technique, via coupling to our code DisCoTec [0].</p>
<p>Now for another project, we were simulating a pure advection
problem with another FEM code, which returned rather unexpected
results. Now I wanted to turn the exact same advection problem
into a DUNE problem to validate the results, but it turns out that
this is quite hard. Two things I am struggling with:</p>
<p>- how do you set periodic boundary conditions in all directions?
So far I only found this old answer [1], and a test using YaspGrid
looks very much like periodicity is only set in one dimension,
even if I supply an all-true argument `periodic`.</p>
<p>- What is the proper way to use a Runge-Kutta 4th-order scheme in
DUNE? AFAICT, pdelab only implements up to order 3 RK methods [2]?<br>
</p>
<p>Maybe you could let me know if there are people who have already
implemented those things.</p>
<p>Best,</p>
<p>Theresa<br>
</p>
<p><br>
</p>
<p>[0] <a class="moz-txt-link-freetext" href="https://github.com/SGpp/DisCoTec">https://github.com/SGpp/DisCoTec</a></p>
<p>[1] <a class="theme markdown__link"
href="https://lists.dune-project.org/pipermail/dune-pdelab/2011-October/000212.html"
rel="noreferrer" target="_blank">https://lists.dune-project.org/pipermail/dune-pdelab/2011-October/000212.html</a></p>
<p>[2]
<a class="moz-txt-link-freetext" href="https://github.com/dune-project/dune-pdelab/blob/master/dune/pdelab/instationary/onestepparameter.hh">https://github.com/dune-project/dune-pdelab/blob/master/dune/pdelab/instationary/onestepparameter.hh</a><br>
</p>
<pre class="moz-signature" cols="72">--
Theresa Pollinger
Universität Stuttgart
Institut für Parallele und Verteilte Systeme
Simulation Software Engineering
Universitätsstr. 38
70569 Stuttgart
Phone: +49 711 685 60921</pre>
</body>
</html>