Zobrazeno 1 - 10
of 639
pro vyhledávání: '"Nishikawa, Hiroaki"'
Autor:
Nishikawa, Hiroaki
Publikováno v:
Volume 491, 112389, Journal of Computational Physics, 15 October 2023
In this short note, we discuss the circumstances that can lead to a failure to observe the design order of discretization error convergence in accuracy verification when solving a time-dependent problem. In particular, we discuss the problem of faili
Externí odkaz:
http://arxiv.org/abs/2305.10331
Autor:
Nishikawa, Hiroaki, White, Jeffery A.
Publikováno v:
Journal of Computational Physics, Volume 490, 1 October 2023, 112324
In this paper, we propose an efficient quadratic interpolation formula utilizing solution gradients computed and stored at nodes and demonstrate its application to a third-order cell-centered finite-volume discretization on tetrahedral grids. The pro
Externí odkaz:
http://arxiv.org/abs/2305.01466
Autor:
Nishikawa, Hiroaki, Diskin, Boris
In this short note, we discuss the use of arithmetic averages for the evaluation of viscous coefficients such as temperature and velocity components at a face as required in a cell-centered finite-volume viscous discretization on unstructured grids,
Externí odkaz:
http://arxiv.org/abs/2203.08334
Publikováno v:
In Patient Education and Counseling June 2024 123
This paper introduces a novel approach to compute the numerical fluxes at the cell boundaries for a cell-centered conservative numerical scheme. Explicit gradients used in deriving the reconstruction polynomials are replaced by high-order gradients c
Externí odkaz:
http://arxiv.org/abs/2110.05461
Autor:
Padway, Emmett, Nishikawa, Hiroaki
Publikováno v:
AIAA Journal, Volume 60, Number 3, pp.1415-1439, March 2022
In this paper, we discuss the U-MUSCL reconstruction scheme -- an unstructured-grid extension of Van Leer's kappa-scheme -- proposed by Burg for the edge-based discretization [AIAA Paper 2005-4999]. This technique has been widely used in practical un
Externí odkaz:
http://arxiv.org/abs/2104.01292
Autor:
Nishikawa, Hiroaki
In this paper, we explore methods for computing wall-normal derivatives used for calculating wall skin friction and heat transfer over a solid wall in unstructured simplex-element (triangular/tetrahedral) grids generated by anisotropic grid adaptatio
Externí odkaz:
http://arxiv.org/abs/2101.11475
Autor:
Nishikawa, Hiroaki
Publikováno v:
International Journal for Numerical Methods in Fluids, 2021
In this paper, we clarify reconstruction-based discretization schemes for unstructured grids and discuss their economically high-order versions, which can achieve high-order accuracy under certain conditions at little extra cost. The clarification le
Externí odkaz:
http://arxiv.org/abs/2012.08213
Autor:
Nishikawa, Hiroaki
Publikováno v:
Communications in Computational Physics, 30 (2021), pp. 1037-1060
In this paper, we reveal a mechanism behind a false accuracy verification encountered with unstructured-grid schemes based on solution reconstruction such as UMUSCL. Third- (or higher-) order of accuracy has been reported for the Euler equations in t
Externí odkaz:
http://arxiv.org/abs/2008.12059
Autor:
Nishikawa, Hiroaki
In this paper, we discuss two grid-quality measures, F- and G-measures, in relation to iterative convergence of an implicit unstructured-grid Navier-Stokes solver. The F-measure is a lower bound of a least-squares gradient, which is a purely geometri
Externí odkaz:
http://arxiv.org/abs/2008.12164