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Title: A high-order discontinuous Galerkin method with unstructured space–time meshes for two-dimensional compressible flows on domains with large deformations

Journal Article · · Computers and Fluids
 [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)

We introduce a high-order accurate space-time discontinuous Galerkin method for solving two-dimensional compressible flow problems on fully unstructured space-time meshes. The discretization is based on a nodal formulation, with appropriate numerical fluxes for the first and the second-order terms, respectively. The scheme is implicit, and we solve the resulting non-linear systems using a parallel Newton-Krylov solver. The meshes are produced by a mesh moving technique with element connectivity updates, and the corresponding space-time elements are produced directly based on these local operations. To obtain globally conforming tetrahedral meshes, we first derive the required conditions on a prism boundary mesh to allow for a valid local triangulation. Next, we present an efficient algorithm for finding a global mesh that satisfies these conditions. We additionally show how to add and remove mesh nodes, again using local constructs for the space-time mesh. Our approach is demonstrated on a number of test problems, showing the high-order accuracy for model problems, and the ability to solve flow problems on domains with complex large deformations.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; FA9550-10-1-0229
OSTI ID:
1524036
Alternate ID(s):
OSTI ID: 1245264
Journal Information:
Computers and Fluids, Vol. 118, Issue C; ISSN 0045-7930
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Weight‐adaptive isogeometric analysis for solving elastodynamic problems based on space‐time discretization approach
  • Izadpanah, E.; Shojaee, S.; Hamzehei‐Javaran, S.
  • International Journal for Numerical Methods in Engineering, Vol. 119, Issue 10 https://doi.org/10.1002/nme.6082
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Figures / Tables (16)