TY  - JOUR
AU  - Mirkov, Nikola S.
AU  - Rasuo, Bosko
AU  - Kenjeres, Sasa
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/268
AB  - This article presents a new and substantially improved finite volume procedure for simulation of incompressible flows on non-orthogonal grids. Cell-centered least-squares gradients are obtained in a robust and highly accurate way. A new discretization of the diffusive terms is employed, which is based on extension of the original cell-face gradient interpolation and is more suitable for complex grid distortions. A flexible flux-limited interpolation of dependent variables on distorted computational grids is introduced. An efficient preconditioner for Krylov method solution of linear systems is proposed, which substantially improves the solution of Poisson equation for pressure correction. The pressure-correction algorithm is adapted for efficient convergence on highly complex grids using a sequence of non-orthogonal corrector solutions and its effect on iteration convergence is analyzed. The non-orthogonalities treated by current procedure are more accustomed to numerical grids generated from a real complex terrain elevation data. The main focus is on the simulation of atmospheric micro-scale flows pertinent to wind energy application.
T2  - Journal of Computational Physics
T1  - On the improved finite volume procedure for simulation of turbulent flows over real complex terrains
VL  - 287
SP  - 18
EP  - 45
DO  - 10.1016/j.jcp.2015.02.001
ER  - 

@article{
author = "Mirkov, Nikola S. and Rasuo, Bosko and Kenjeres, Sasa",
year = "2015",
abstract = "This article presents a new and substantially improved finite volume procedure for simulation of incompressible flows on non-orthogonal grids. Cell-centered least-squares gradients are obtained in a robust and highly accurate way. A new discretization of the diffusive terms is employed, which is based on extension of the original cell-face gradient interpolation and is more suitable for complex grid distortions. A flexible flux-limited interpolation of dependent variables on distorted computational grids is introduced. An efficient preconditioner for Krylov method solution of linear systems is proposed, which substantially improves the solution of Poisson equation for pressure correction. The pressure-correction algorithm is adapted for efficient convergence on highly complex grids using a sequence of non-orthogonal corrector solutions and its effect on iteration convergence is analyzed. The non-orthogonalities treated by current procedure are more accustomed to numerical grids generated from a real complex terrain elevation data. The main focus is on the simulation of atmospheric micro-scale flows pertinent to wind energy application.",
journal = "Journal of Computational Physics",
title = "On the improved finite volume procedure for simulation of turbulent flows over real complex terrains",
volume = "287",
pages = "18-45",
doi = "10.1016/j.jcp.2015.02.001"
}

Mirkov, N. S., Rasuo, B.,& Kenjeres, S.. (2015). On the improved finite volume procedure for simulation of turbulent flows over real complex terrains. in Journal of Computational Physics, 287, 18-45.
https://doi.org/10.1016/j.jcp.2015.02.001

Mirkov NS, Rasuo B, Kenjeres S. On the improved finite volume procedure for simulation of turbulent flows over real complex terrains. in Journal of Computational Physics. 2015;287:18-45.
doi:10.1016/j.jcp.2015.02.001 .

Mirkov, Nikola S., Rasuo, Bosko, Kenjeres, Sasa, "On the improved finite volume procedure for simulation of turbulent flows over real complex terrains" in Journal of Computational Physics, 287 (2015):18-45,
https://doi.org/10.1016/j.jcp.2015.02.001 . .

TY  - CONF
AU  - Mirkov, Nikola S.
AU  - Rasuo, Bosko
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7144
AB  - In this paper, we present a numerical study of the wall jet flow over a convex surface, viz. the Coanda wall jet, and its application to a conceptual Unmanned Aerial Vehicle (UAV) design which uses the Coanda effect as a basis of lift production. This configuration is important in a way that it considers the Coanda wall jet over a smooth convex wall with non-constant curvature, in contrast to most of the previous situations where only constant curvature walls were considered e.g. the Coanda wall jet over circular cylinder. To enable the mathematical representation of this complex geometrical configuration, we propose a form of a parametric representation of the conceptual geometry, based on Bernstein polynomials, which is universal in character and spans a complete design space. It is shown how dynamically changing the flow picture enables smooth change of net forces on the body. Capability to control the direction of the net force is shown to be useful for maneuvering the UAV. All simulations are done using an open-source finite-volume computational fluid dynamics code based on Reynolds-averaged Navier-Stokes equations. Turbulence is accounted for using the k-omega Shear Stress Transport model.
C3  - Lecture Notes in Computational Science and Engineering
T1  - Numerical Simulation of Air Jet Attachment to ConvexWalls and Application to UAV
VL  - 108
SP  - 197
EP  - 207
DO  - 10.1007/978-3-319-25727-3_15
ER  - 

@conference{
author = "Mirkov, Nikola S. and Rasuo, Bosko",
year = "2015",
abstract = "In this paper, we present a numerical study of the wall jet flow over a convex surface, viz. the Coanda wall jet, and its application to a conceptual Unmanned Aerial Vehicle (UAV) design which uses the Coanda effect as a basis of lift production. This configuration is important in a way that it considers the Coanda wall jet over a smooth convex wall with non-constant curvature, in contrast to most of the previous situations where only constant curvature walls were considered e.g. the Coanda wall jet over circular cylinder. To enable the mathematical representation of this complex geometrical configuration, we propose a form of a parametric representation of the conceptual geometry, based on Bernstein polynomials, which is universal in character and spans a complete design space. It is shown how dynamically changing the flow picture enables smooth change of net forces on the body. Capability to control the direction of the net force is shown to be useful for maneuvering the UAV. All simulations are done using an open-source finite-volume computational fluid dynamics code based on Reynolds-averaged Navier-Stokes equations. Turbulence is accounted for using the k-omega Shear Stress Transport model.",
journal = "Lecture Notes in Computational Science and Engineering",
title = "Numerical Simulation of Air Jet Attachment to ConvexWalls and Application to UAV",
volume = "108",
pages = "197-207",
doi = "10.1007/978-3-319-25727-3_15"
}

Mirkov, N. S.,& Rasuo, B.. (2015). Numerical Simulation of Air Jet Attachment to ConvexWalls and Application to UAV. in Lecture Notes in Computational Science and Engineering, 108, 197-207.
https://doi.org/10.1007/978-3-319-25727-3_15

Mirkov NS, Rasuo B. Numerical Simulation of Air Jet Attachment to ConvexWalls and Application to UAV. in Lecture Notes in Computational Science and Engineering. 2015;108:197-207.
doi:10.1007/978-3-319-25727-3_15 .

Mirkov, Nikola S., Rasuo, Bosko, "Numerical Simulation of Air Jet Attachment to ConvexWalls and Application to UAV" in Lecture Notes in Computational Science and Engineering, 108 (2015):197-207,
https://doi.org/10.1007/978-3-319-25727-3_15 . .

TY  - JOUR
AU  - Jovanović, Rastko D.
AU  - Cvetinović, Dejan
AU  - Erić, Milić D.
AU  - Rasuo, Bosko
AU  - Adžić, Miroljub M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5955
AB  - Numerical modeling is widely used tool for prediction of combustion processes. Computational Fluid Dynamics - CFD models use three kinetic rates for description of the coal combustion processes: coal devolatilization, volatile combustion and char combustion. Reported rates for coal devolatilization vary considerably among the authors depending on the type of experimental systems used in describing the phenomenon. Accurate representation of devolatilization process is necessary in order to perform successful CFD calculations of pulverized coal combustion and gasification. The subject of this work is numerical modeling of Serbian lignite pulverized coal devolatilization in drop tube type laboratory scale reactor. The aim of this study is to evaluate the influence of different devolatilization kinetic factors on total devolatilization time in numerical modeling of pulverized Serbian lignite devolatilization. Nine different devolatilization kinetic rates mostly used in devolatilization numerical modeling are compared in the presented work. (c) 2014 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Sensitivity analysis of different kinetic factors for numerical modeling of Serbian lignite devolatilization process
VL  - 72
SP  - 489
EP  - 500
DO  - 10.1016/j.ijheatmasstransfer.2014.01.036
ER  - 

@article{
author = "Jovanović, Rastko D. and Cvetinović, Dejan and Erić, Milić D. and Rasuo, Bosko and Adžić, Miroljub M.",
year = "2014",
abstract = "Numerical modeling is widely used tool for prediction of combustion processes. Computational Fluid Dynamics - CFD models use three kinetic rates for description of the coal combustion processes: coal devolatilization, volatile combustion and char combustion. Reported rates for coal devolatilization vary considerably among the authors depending on the type of experimental systems used in describing the phenomenon. Accurate representation of devolatilization process is necessary in order to perform successful CFD calculations of pulverized coal combustion and gasification. The subject of this work is numerical modeling of Serbian lignite pulverized coal devolatilization in drop tube type laboratory scale reactor. The aim of this study is to evaluate the influence of different devolatilization kinetic factors on total devolatilization time in numerical modeling of pulverized Serbian lignite devolatilization. Nine different devolatilization kinetic rates mostly used in devolatilization numerical modeling are compared in the presented work. (c) 2014 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Sensitivity analysis of different kinetic factors for numerical modeling of Serbian lignite devolatilization process",
volume = "72",
pages = "489-500",
doi = "10.1016/j.ijheatmasstransfer.2014.01.036"
}

Jovanović, R. D., Cvetinović, D., Erić, M. D., Rasuo, B.,& Adžić, M. M.. (2014). Sensitivity analysis of different kinetic factors for numerical modeling of Serbian lignite devolatilization process. in International Journal of Heat and Mass Transfer, 72, 489-500.
https://doi.org/10.1016/j.ijheatmasstransfer.2014.01.036

Jovanović RD, Cvetinović D, Erić MD, Rasuo B, Adžić MM. Sensitivity analysis of different kinetic factors for numerical modeling of Serbian lignite devolatilization process. in International Journal of Heat and Mass Transfer. 2014;72:489-500.
doi:10.1016/j.ijheatmasstransfer.2014.01.036 .

Jovanović, Rastko D., Cvetinović, Dejan, Erić, Milić D., Rasuo, Bosko, Adžić, Miroljub M., "Sensitivity analysis of different kinetic factors for numerical modeling of Serbian lignite devolatilization process" in International Journal of Heat and Mass Transfer, 72 (2014):489-500,
https://doi.org/10.1016/j.ijheatmasstransfer.2014.01.036 . .