Performance of fast fluid dynamics with a semi-Lagrangian scheme and an implicit upwind scheme in simulating indoor/outdoor airflow

The nonlinear interaction problem is analyzed by simultaneously solving the mass, momentum, and energy conservation equations together .with appropriate material constitutive equations governing the fluid dynamics of the explosion gaseous product and the water and the structural dynamics of the compliant shell. A finite difference technique in a coupled Eulerian–Lagrangian scheme is used. The computer program PISCES 2DELK is employed to carry out the numerical computations. The results demonstrate that to rigorously analyze the response of a submerged structure to a nearby explosion, the interactions among the explosion shock wave, the structure, its surrounding media, and the explosion bubble need to be considered.

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Improvement of fast fluid dynamics with a conservative semi-Lagrangian scheme

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-04-2013-0119 ◽

2015 ◽

Vol 25 (1) ◽

pp. 2-18 ◽

Cited By ~ 11

Author(s):

Mingang Jin ◽

Qingyan Chen

Keyword(s):

Fluid Dynamics ◽

Species Conservation ◽

Advection Equation ◽

Test Cases ◽

Indoor Airflow ◽

Content Type ◽

Numerical Tests ◽

Flow Prediction ◽

Lagrangian Advection ◽

Lagrangian Scheme

Purpose – The purpose of this paper is to develop a simple and efficient conservative semi-Lagrangian scheme (SL) for solving advection equation in fast fluid dynamics (FFD), so FFD can provide fast indoor airflow simulations while preserving conservation for energy and species transport. Design/methodology/approach – This study thus proposed a mass-fixing type conservative SL that redistributes global surplus/deficit on the advected field after performing the standard semi-Lagrangian advection. The redistribution weights were designed to preserve the properties of conservatives and monotonicity. Findings – The effectiveness of the conservative SL was validated with several test cases, and the results show that the proposed scheme is indeed conservative with negligible impact on the accuracy of the standard solutions. The numerical tests show that the proposed scheme was indeed conservative with negligible impact on the accuracy of the flow prediction. Originality/value – The FFD with conservative SL can effectively enforce the energy and species conservation for indoor airflow and predict airflow distributions with reasonable accuracy.

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