TY - JOUR

T1 - Positivity-preserving CE/SE schemes for solving the compressible Euler and Navier–Stokes equations on hybrid unstructured meshes

AU - Shen, Hua

AU - Parsani, Matteo

N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We are grateful to Dr. David Ketcheson for his valuable help on improving the manuscript, and would also like to acknowledge the computer time provided by the Extreme Computing Research Center at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia.

PY - 2018/5/28

Y1 - 2018/5/28

N2 - We construct positivity-preserving space–time conservation element and solution element (CE/SE) schemes for solving the compressible Euler and Navier–Stokes equations on hybrid unstructured meshes consisting of triangular and rectangular elements. The schemes use an a posteriori limiter to prevent negative densities and pressures based on the premise of preserving optimal accuracy. The limiter enforces a constraint for spatial derivatives and does not change the conservative property of CE/SE schemes. Several numerical examples suggest that the proposed schemes preserve accuracy for smooth flows and strictly preserve positivity of densities and pressures for the problems involving near vacuum and very strong discontinuities.

AB - We construct positivity-preserving space–time conservation element and solution element (CE/SE) schemes for solving the compressible Euler and Navier–Stokes equations on hybrid unstructured meshes consisting of triangular and rectangular elements. The schemes use an a posteriori limiter to prevent negative densities and pressures based on the premise of preserving optimal accuracy. The limiter enforces a constraint for spatial derivatives and does not change the conservative property of CE/SE schemes. Several numerical examples suggest that the proposed schemes preserve accuracy for smooth flows and strictly preserve positivity of densities and pressures for the problems involving near vacuum and very strong discontinuities.

UR - http://hdl.handle.net/10754/627991

UR - http://www.sciencedirect.com/science/article/pii/S0010465518301747

UR - http://www.scopus.com/inward/record.url?scp=85048125471&partnerID=8YFLogxK

U2 - 10.1016/j.cpc.2018.05.011

DO - 10.1016/j.cpc.2018.05.011

M3 - Article

SN - 0010-4655

VL - 232

SP - 165

EP - 176

JO - Computer Physics Communications

JF - Computer Physics Communications

ER -