TimeProjector #154
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…irksome into rckirby/galerkin_label
…Irksome into rckirby/galerkin_label
rckirby
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May 28, 2025
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rckirby
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Mostly good (I think).
- Do we know that the approach being used here doesn't explode the complexity when we use projectors? How would we check?
- Can we get a demo before merging.
| ref_el = L_test.get_reference_element() | ||
| phisub = vecconst(Legendre(ref_el, L_test.degree()).tabulate(0, qpts)[(0,)].T) | ||
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| # preprocess time derivatives |
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comment is no longer accurate here.
| Q = o.quadrature | ||
| assert order+1 <= len(self.phi) | ||
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| # compute the hierarchical mass matrix (always the identity) |
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If it's the identity why do we compute it?
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| # compute the L2-Riesz representation by undoing the integral against the test coefficient | ||
| fc = sum(it.integrand() for it in Fc.integrals()) | ||
| fproj = expand_derivatives(diff(fc, c)) |
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This seems unclear to me what's actually happening.
…/Irksome into pbrubeck/time-projector
pbrubeck
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Jul 31, 2025
irksome/galerkin_stepper.py
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| v: vsub[q] * dt, | ||
| u0: usub[q], | ||
| dtu0: dtu0sub[q] / dt} | ||
| u0: u0 + usub[q], |
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Here we are solving for an update
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Enable projection-in-time of expressions (usually the Gateaux derivative of a conserved quantity). This is useful to eliminate auxiliary variables.