Hello everyone, I work with inhomogeneous Helmholtz equation and i wonder if the PointSource that was available in dolfin will be implemented in dolfinx. Right now i am approximating it with the following steps: delta = interpolate narrow normal distribution integrate delta over volume defining …

I am planning to reimplement it next week. It should be quite straightforward now.

That would be one way to approximate a point source. Even a “true” point source will typically result in low-order accuracy anyway (due to the low regularity of the exact solution), so a Gaussian with O(h) standard deviation that is explicitly normalized using the same quadrature rule that it will …

Amazing! As always, thank you very much. With that, I am planning to make a tutorial about Helmholtz equation applied on computational acoustics and a comparison with commercial software (Actran, Comsol, Simcenter 3D, etc.)

Hi kamensky, How can I check which quadrature rule I am using? What is the default value for standard lagrange elements 1st and 2nd order?

Hi dokken. Are there news about Point Source reimplementation? Thank you

The parallel bit of it required some more thought than I first expected. However, if you want something that works in serial, I can give you a simply implementation for that.

Hi Everyone, Wanted to ask if PointSource has been completed or is nearing completion anytime soon? I suppose I could go back to fenics but it would have been nice to use fenicsx as I have a preference over hexahedral meshes at the moment (imported from gmsh which I understand is not supported by …

Hi everyone, I am also interested in this topic. Currently, I am in the process of migrating some scripts that utilize point sources from FEniCS to FEniCSx. I tried to add them with methods described in the topic Dirac delta distribution (dolfinx) but so far without success. Reimplementation of Poi…

Hi dokken, Would it be possible to get a copy of the simple implementation as well? I’d greatly appreciate it.

PointSource in dolfinx

dolfinx

dokken May 23, 2022, 12:56pm 6

The quadrature rule depends on the variational form, and is estimated by ufl if not explicitly supplied. See: How many integration points are included in the tetrahedral grid? - #2 by dokken for more details

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PointSource in dolfinx

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