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Abbreviated names | rHCT, HCT-red |
Degrees | \(k=3\) |
Reference elements | triangle |
DOFs | On each vertex: point evaluations, and point evaluations of first derivatives |
Number of DOFs | triangle: \(9\) |
Mapping | identity |
continuity | Function values and derivatives are continuous. |
Categories | Scalar-valued elements, Macro elements |
This element is implemented in
FIAT and
Symfem .
↓ Show implementation detail ↓↑ Hide implementation detail ↑FIAT | FIAT.HsiehCloughTocher(..., reduced=True) ↓ Show FIAT examples ↓↑ Hide FIAT examples ↑Before running this example, you must install FIAT: pip3 install git+https://github.com/firedrakeproject/fiat.git This element can then be created with the following lines of Python: import FIAT
# Create reduced Hsieh-Clough-Tocher degree 3 element = FIAT.HsiehCloughTocher(FIAT.ufc_cell("triangle"), 3, reduced=True) This implementation is correct for all the examples below.Note: This implementation includes additional DOFs that are used then filtered out when mapping the element, as described in Kirby (2018). |
Symfem | "rHCT" ↓ Show Symfem examples ↓↑ Hide Symfem examples ↑Before running this example, you must install Symfem: pip3 install symfem This element can then be created with the following lines of Python: import symfem
# Create reduced Hsieh-Clough-Tocher degree 3 on a triangle element = symfem.create_element("triangle", "rHCT", 3) This implementation is used to compute the examples below and verify other implementations. |
- Clough, Ray W. and Tocher, James L. Finite element stiffness matrices for analysis of plate bending, Proceedings of the First Conference on Matrix Methods in Structural Mechanics, 515–546, 1965. [BibTeX]
- Ciarlet, Philippe G. Interpolation error estimates for the reduced Hsieh–Clough–Tocher triangle, Mathematics of Computation 32, 335–344, 1978. [DOI: 10.1090/S0025-5718-1978-0482249-1] [BibTeX]
- Kirby, Robert C. A general approach to transforming finite elements, SMAI Journal of Computational Mathematics 4, 197–224, 2018. [DOI: 10.5802/smai-jcm.33] [BibTeX]
Element added | 08 March 2021 |
Element last updated | 27 September 2024 |