Numerical investigations of turbulent free surface flows using TOPUS scheme

Self Cite

In this work, the nonlinear Euler equations of gas dynamics are employed for a comparative study of the frequently used flux limiters, namely: the consecrated ARORA-ROE, van Albada, CUBISTA and ADBQUICKEST; and two rational functions TVD-CBC-based TOPUS and SDPUS-C1 schemes. The comparison is mainly done in terms of their abilities in resolving discontinuities, reproducing complex flow phenomena and accuracy. It is concluded that both TOPUS and SDPUS-C1 can be considered as alternative tools for computer simulations of fluid flow. As application, the corresponding SDPUS-C1 scheme is employed to simulate 2D/3D incompressible flows with moving free surfaces.

Section: Discussionmentioning

confidence: 99%

Numerical simulation of upwinding schemes applied to complex fluid dynamics equations

Candezano

Corrêa

Cirilo

et al. 2019

Self Cite

“…Heat and mass flux were disregarded to room objects, with the exception of lighting fixture, surgical light and anesthesia machine, with constant and uniformly distributed heat flux rate. Moreover, to avoid using too many grid points in the viscous sub-layer, the wall function is used near the walls for variables and [13,22,32,37].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Assessment of the performance of airflow in an operating rooms using ceiling supply and sidewall inlet systems

Baracat

Silva

Lofrano

et al. 2019

Self Cite

Poor air quality arises by and large from inadequate ventilation and presence of contaminants. In particular to hospital environments, it exercises direct and significant influence over infections occurrence. The purpose of this paper is to research, through computational fluid dynamics, how ceiling (four-way supply) and sidewall (conventional high supply) inlets systems, as well as outlet (exhaust) positioning, effect air motion and distribution in operating rooms. By the assistance of numerical modeling, four alternative scenarios of a operating room were investigated, maintaining flow rates and varying inlet system and outlet position. The results are presented in terms of velocity vectors and temperatures, which were compared to the experimental data available. Subsequently, a qualitative analysis regarding conformity to sanitary requirements was conducted.

“…This free surface flow problem was first investigated experimentally by Martin and Moyce [35] to study the falling rate and the spreading velocity of water columns. Since then, various researchers have investigated experimentally (for example, [19,28,44]) and numerically (for example, [10,26,27,39]), this problem is as a benchmark test free surface flow numerical methods. Furthermore, Violeau and Issa [49] used this problem to check the performance of Using j À e turbulence model and the ADBQUICKEST scheme implemented into the 3D version of the Freeflow simulation system [7], we performed numerical simulation of this unsteady free surface flow.…”

Section: Dam-break Flowsmentioning

confidence: 99%

“…The basic idea behind these schemes is to maintain stability of the numerical solution, to resolve discontinuities or shocks, and to be computationally simple, economical, and convergent. In particular, the schemes WACEB [43], CUBISTA [1], ADBQUICKEST [25], and TOPUS [39] have been applied in a wide range of problems. Among them, the ADBQUICKEST scheme is the most flexible, since it takes into consideration the local Courant number in its formulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of 3D unsteady turbulent free surface flows using $$\kappa -\varepsilon$$ κ - ε model and ADBQUICKEST scheme

Kurokawa

Corrêa

Queiroz

2018

Self Cite

This work deals with the development of a numerical technique to simulate 3D complex turbulent free surface flows. This technique is based on the finite-difference GENSMAC methodology coupled with high Reynolds j À e turbulence model and the ADBQUICKEST upwind scheme to deal with the advective terms. The computations are performed using the 3D version of the Freeflow simulation system, in which the effectiveness of the numerical technique is analyzed for the dambreak flow and a turbulent jet impinging orthogonally onto a flat surface. The numerical results are compared with existing analytical and experimental data. To demonstrate applicability of the Freeflow-3D simulation system for solving complex free surface flows at high Reynolds numbers, a case of the fluid-structure interaction was simulated. Keywords Finite-difference method Á Reynolds average Navier-Stokes equations Á High-order upwind scheme Á Turbulent free surface flow Á Numerical simulation