On the improved finite volume procedure for simulation of turbulent flows over real complex terrains

Mirkov, Nikola; Rašuo, Boško; Kenjereš, Saša

doi:10.1016/j.jcp.2015.02.001

Cited by 18 publications

(18 citation statements)

References 48 publications

(93 reference statements)

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“…Here, the numerical study is not concerned with the development of numerical methods for simulation of turbulent flows. However, important studies in the literature have been devoted for this kind of analysis [30,31]. In the present work, a first investigation of air flow in a H.O.M.E.R nozzle is simulated and results for deflection angle of jet are compared with those obtained by Trancossi and Dumas [24].…”

Section: Introductionmentioning

confidence: 95%

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

Halal

Marques

Rocha

et al. 2019

JMSE

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In the present work it is performed a numerical study for simulation of turbulent air and water flows in a nozzle based on the Coanda effect named H.O.M.E.R. (High-Speed Orienting Momentum with Enhanced Reversibility). The main purposes of this work are the development of a numerical model for simulation of the main operational principle of the H.O.M.E.R. nozzle, verify the occurrence of the physical principle in a device using water as working fluid and generate theoretical recommendations about the influence of the difference of mass flow rate in two inlets and length of septum over the fluid dynamic behavior of water flow. The time-averaged conservation equations of mass and momentum are solved with the Finite Volume Method (FVM) and turbulence closure is tackled with the k-ε model. Results for air flow show a good agreement with previous predictions in the literature. Moreover, it is also noticed that this main operational principle is promising for future applications in maneuverability and propulsion systems in marine applications. Results obtained here also show that water jets present higher deflection angles when compared with air jets, enhancing the capability of impose forces to achieve better maneuverability. Moreover, results indicated that the imposition of different mass flow rates in both inlets of the device, as well as central septum insertion have a strong influence over deflection angle of turbulent jet flow and velocity fields, indicating that these parameters can be important for maneuverability in marine applications.

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Section: Introductionmentioning

confidence: 95%

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

Halal

Marques

Rocha

et al. 2019

JMSE

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“…This computer code is used as a platform for numerous additional extensions to mimic some essential features of atmospheric and environmental flows. Some of the most important features include: (i) possibility to simulate a complex terrain orography [17], (ii) an efficient mesh generation and visualization tools to take into account the presence of buildings within the complex urban areas [13,18,19] (iii) the presence of vegetation and surface roughness effects [20], (iv) ability to use a highly skewed mesh for air flows around hilly or mountain terrains [21], (v) inclusion of complex atmospheric chemistry for proper simulations of the ozone distribution [22], (vi) as well as the radiation and ground/soil conductivity effects as a part of the global energy balance for simulation of the urban heat island phenomenon [23,24].…”

Section: Numerical Details Of the Finite-volume Code For A Heavy Gas mentioning

confidence: 99%

Numerical Modeling of the Macroscopic Behavior of a Crowd of People under Emergency Conditions Triggered by an Incidental Release of a Heavy Gas: an Integrated Approach

Kenjereš

Zwinkels

2019

Flow Turbulence Combust

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In the present study, we focus on modeling and simulations of macroscopic behavior of a crowd of people under emergency conditions. We present a newly developed integrated numerical approach, which combines the time-dependent RANS method in predicting the temporal and spatial evolution of a heavy gas turbulent dispersion with the macroscopic model of a crowd movement. The coupling is imposed through locally determined concentration of the heavy gas which directly impacts the movement of the crowd of people. The potential of the developed approach is demonstrated in a series of cases that include the crowd behavior on an open railway platform and inside a train station, as well as predictions of field studies of turbulent dispersion of a heavy gas under windy conditions. Finally, various scenarios have been analyzed of the coupling between the local concentration of a potentially harmful heavy gas on crowd behavior through different forms of the cost functions. In conclusion, the version of the integrated model is recommended for future optimization studies of crowd dynamics following an incidental release of heavy gas.

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“…The code used in the present study is based on the second-order finite volume method. The variable arrangement is cell-centered, pressure and velocities are collocated, and it is especially adapted for grids consisting of highly distorted computational cells [1]. The distinguishing characteristic of the present algorithm is consistent application of corrections taking Table 1.…”

Section: Numerical Algorithmmentioning

confidence: 99%

“…It is based on the QR decomposition and devised to minimize the number of arithmetic operations needed in gradient field update, repeated several times during simulation, for all variables (pressure, velocity components, and turbulence scalars). Details of the procedure may be found in [1].…”

Section: Numerical Algorithmmentioning

confidence: 99%

New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains

Mirkov¹,

Stevanovic²

2016

THERM SCI

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In this paper we validate an improved finite volume approximation of Reynolds Averaged Navier-Stokes equations for simulation of wind flows in body-fitted grids generated by algebraic extrusion from digital terrain elevation data, proposed in N. Mirkov et. al. J. Comput. Phys. 287, 18-45(2015), [1]. The approach is based on second-order accurate finite volume method with collocated variable arrangement and pressure-velocity coupling trough SIMPLE algorithm. The main objective is the attenuation of spurious pressure field oscillations in regions with discontinuity in grid line slopes, as encountered in grids representing highly non-uniform terrains. Moreover, the approach relaxes the need for grid generation based on elliptic PDEs or grid smoothing by applying fixed point iterations (i.e. Gauss-Seidel) to initial grid node positions resulting from algebraic grid generators. Drawbacks of previous approaches which ignored treatment of finite volume grid cell cases with intersection point offset in non-orthogonality corrections are removed. Application to real-life wind farm project at Dobric (Srvljig, Serbia) is used to assess the effectiveness of the method. The results validate the view in which accurate discretization of governing equations play more important role than the choice of turbulence modelling closures. [Projekat Ministarstva nauke Republike Srbije, br. TR-33036]

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On the improved finite volume procedure for simulation of turbulent flows over real complex terrains

Cited by 18 publications

References 48 publications

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect

Numerical Modeling of the Macroscopic Behavior of a Crowd of People under Emergency Conditions Triggered by an Incidental Release of a Heavy Gas: an Integrated Approach

New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains

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