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Sutthisak?Phongthanapanich Pramote?DechaumphaiEmail author 《Journal of Mechanical Science and Technology》2004,18(12):2190-2203
A combined procedure for two-dimensional Delaunay mesh generation algorithm and an adaptive remeshing technique with higher-order
compressible flow solver is presented. A pseudo-code procedure is described for the adaptive remeshing technique. The flux-difference
splitting scheme with a modified multidimensional dissipation for high-speed compressible flow analysis on unstructured meshes
is proposed. The scheme eliminates nonphysical flow solutions such as the spurious bump of the carbuncle phenomenon observed
from the bow shock of the flow over a blunt body and the oscillation in the odd-even grid perturbation in a straight duct
for the Quirk’s odd-even decoupling test. The proposed scheme is further extended to achieve higher-order spatial and temporal
solution accuracy. The performance of the combined procedure is evaluated on unstructured triangular meshes by solving several
steady-state and transient high-speed compressible flow problems. 相似文献
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The resultant traffic flows in a preferred direction within a set of cooperative gateway nodes is optimized taking into consideration the internal rate-delay products. The internal rates on directed links among adjacent gateway nodes are included in the set of control variables. It is also shown that the optimal internal rate-delay product of a set of connected gateway nodes can be obtained by locally optimizing in each node the rates of either the input ports or the output ports. The effectiveness of the proposed optimization algorithm is demonstrated for a typical sample gateway of three nodes with inhomogeneous arrival and service rates. 相似文献
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An object-oriented finite element/finite volume software, EasyFEM, has been developed. The software, with a fully interactive graphics interface, analyses heat transfer, solid mechanics, and fluids problems by the finite element and the finite volume methods. The Coad and Yourdon methodology is used to describe the general structure of classes and objects implemented by the software. Details of the object-oriented classes for both the graphics pre- and post-processors, as well as for the analysis solutions, are described. Several case studies with graphical representations of numerical solutions are presented to illustrate some functionalities of the software. 相似文献
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Abstract A flux‐difference splitting scheme with a modified multidimensional dissipation for high‐speed compressible flow analysis on unstructured meshes is presented. The scheme eliminates unphysical flow behaviors such as a spurious bump of the carbuncle phenomenon that occurs on the bow shock from flow over a blunt body, and the expansion shock generated from flow over a forward facing step. The switching function suggested by Quirk is implemented as a choice to detect the vicinity of strong shock. The proposed scheme is further extended to obtain higher‐order spatial and temporal solution accuracy. The scheme is, in addition, combined with an adaptive meshing technique that generates unstructured triangular meshes to resemble the flow phenomena for reducing computational effort. The entire procedure is evaluated by solving several benchmarks as well as steady‐state and transient high‐speed compressible flow problems. 相似文献
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Sutthisak Phongthanapanich Pramote Dechaumphai 《Journal of Mechanical Science and Technology》2009,23(3):790-801
A combined finite volume and finite element method is presented for solving the unsteady scalar convection-diffusion-reaction
equation in two dimensions. The finite volume method is used to discretize the convection-diffusion-reaction equation. The
higher-order reconstruction of unknown quantities at the cell faces is determined by Taylor’s series expansion. To arrive
at an explicit scheme, the temporal derivative term is estimated by employing the idea of local expansion of unknown along
the characteristics. The concept of the finite element technique is applied to determine the gradient quantities at the cell
faces. Robustness and accuracy of the method are evaluated by using available analytical and numerical solutions of the two-dimensional
pure-convection, convection-diffusion and convection-diffusion-reaction problems. Numerical test cases have shown that the
method does not require any artificial diffusion to improve the solution stability.
This paper was recommended for publication in revised form by Associate Editor Dongshin Shin
Pramote Dechaumphai received his B.S. degree in Industrial Engineering from Khon-Kaen University, Thailand, in 1974, M.S. degree in Mechanical
Engineering from Youngstown State University, USA in 1977, and Ph.D. in Mechanical Engineering from Old Dominion University,
USA in 1982. He is currently a Professor of Mechanical Engineering at Chulalongkorn University, Bangkok, Thailand. His research
interests are numerical methods, finite element method for thermal stress and computational fluid dynamics analysis.
Sutthisak Phongthanapanich received his B.S. degree in Mechanical Engineering from Chiangmai University, Thailand in 1990. He then received his M.S.,
and Ph.D. degrees in Mechanical Engineering from Chulalongkorn University, Thailand in 2002, and 2006, respectively. He is
a Lecturer of Mechanical Engineering Technology at King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.
His research interests are finite element method, finite volume method, mesh generation and adaptation, and shock wave dynamics. 相似文献
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Sutthisak Phongthanapanich Pramote Dechaumphai 《Journal of Mechanical Science and Technology》2008,22(4):639-646
A nodeless variable element is combined with an adaptive meshing technique to improve solution accuracy of the finite element
method for analyzing two-dimensional elasticity problems. The nodeless variable element employs quadratic interpolation functions
to provide higher solution accuracy without requiring additional actual nodes. The fluxbased formulation is developed for
the nodeless variable finite element to reduce the complexity in deriving the finite element equations as compared to the
conventional finite element method. The superconvergent patch recovery procedure is implemented to compute accurate stresses
from the nodeless variable finite element solutions. The effectiveness of the combined procedure for providing higher solution
convergence rate from the proposed formulation is evaluated by two well-known examples. 相似文献
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