From: John P. <pet...@cf...> - 2005-02-01 19:13:06
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Michael Schindler writes: > Hello Ben and John, > > On 01.02.05, KIRK, BENJAMIN (JSC-EG) (NASA) wrote: > > Sure... Examples 3 and 4 use 9-noded biquadratic quadrilaterals in 2D. > > Also, the middle node need not lie in the geometric center of the two > > vertices. By default, the second-order elements in libMesh are treated > > isoparametrically, which allows them to approximate curved boundaries with a > > quadratic line segment. > thanks for the quick answer. > > I would like to solve a Stokes equation which is a vector equation. > With higher-order elements the Christoffel-Symbols in the equation are > not zero anymore. Is there an interface to get the > Christoffel-Symbols, similar to the integration-weights? Hm...it sounds like you are some kind of winky-dink mathematician or something ;-) There's no interface like that in libmesh, in fact I've never heard of Christoffel symbols...are you solving some kind of problem on a non-Euclidean manifold? -John |