Searched for: author%3A%22Hanjalic%2C+K.%22
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Hadžiabdić, Muhamed (author), Hafizović, Mahir (author), Ničeno, Bojan (author), Hanjalic, K. (author)
We report on the application and comparative assessment of two rational turbulence modelling approaches for the computer simulation of air flow and pollutant dispersion in real urban environment: a stand-alone unsteady Reynolds-averaged Navier-Stokes eddy-viscosity model (URANS), and its blend with Large-eddy simulations (LES) in a hybrid...
journal article 2022
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Hanjalic, K. (author), Launder, B. E. (author)
This paper examines the evolution of closing the Reynolds-averaged Navier-Stokes equations by approximating the Reynolds stresses via the second-moment transport equations themselves. This strategy first proposed by Rotta is markedly in contrast to the more usual approach of computing an effective “turbulent viscosity” to deduce the turbulent...
review 2021
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Dulin, V. M. (author), Lobasov, A. S. (author), Chikishev, L. M. (author), Markovich, D. M. (author), Hanjalic, K. (author)
We report on a study of the impact of coherent helical vortex structures on the shape of the reaction zone and heat release in swirling methane/air flames in regimes with a vortex breakdown. Three kinds of atmospheric flames are considered, viz., fuel-lean and fuel-rich premixed flames and a partially premixed fuel-rich lifted flame. Based on...
journal article 2019
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Timoshevskiy, Mikhail V. (author), Pervunin, Konstantin S. (author), Markovich, Dmitriy M. (author), Hanjalic, K. (author)
We studied cavitating flow over the suction side of a symmetric 2D foil - a scaled-down model of high-pressure hydroturbine guide vanes (GV) - in different cavitation regimes at several attack angles. High-speed imaging was used to analyze spatial patterns and time dynamics of the gas-vapor cavities, as well as for evaluating the...
conference paper 2019
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Hrebtov, Michael (author), Hanjalic, K. (author)
Seasonal variation of air quality in a city with a large river was investigated by means of numerical simulations of air movement and pollutant dispersion over inversion-capped diurnal cycles using a Reynolds-averaged Navier-Stokes (RANS) approach with algebraic turbulent flux model. The study accounts for the effects of urban heat island ...
journal article 2019
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Shtork, Sergey I. (author), Litvinov, Ivan V. (author), Gorelikov, Evgeny Y. (author), Mitryakov, Andrey S. (author), Hanjalic, K. (author)
The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the...
abstract 2018
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Mullyadzhanov, R. I. (author), Sandberg, R. D. (author), Abdurakipov, S. S. (author), George, W. K. (author), Hanjalic, K. (author)
Turbulent jets are known to support large-scale vortical wave packets traveling downstream. We show that a propagating helical wave represents a common form of the "optimal" eigenfunction tracking these structures from the near to the far field of a round jet issuing from a pipe. Two first mirror-symmetric modes containing around 5% of the...
journal article 2018
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Palkin, Egor (author), Shestakov, Mikhail (author), Mullyadzhanov, Rustam (author), Markovich, Dmitry (author), Hanjalic, K. (author)
We study the flow over a cylinder placed between two parallel rigid walls using Large-eddy simulations and Particle Image Velocimetry. The Reynolds number based on the inflow velocity and diameter of the cylinder is 3750 corresponding to the subcritical regime with laminar separation. Three-dimensional visualization shows the presence of the...
journal article 2017
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Palkin, Egor V. (author), Mullyadzhanov, Rustam I. (author), Hadziabdic, M (author), Hanjalic, K. (author)
Relevance. Characteristics of separated turbulent streams are of great importance when designing effective hydroand thermal power plants equipment. In such streams the flow regimes with harmful quasi-periodic high-amplitude oscillations of velocity and pressure behind the body are implemented. Thus, the knowledge on the ways of controlling...
journal article 2016
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Palkin, Egor (author), Hadziabdic, M (author), Hanjalic, K. (author)
We perform a series of URANS simulations of the flow over a rotary oscillating cylinder at Re = 1.4 10<sup>5</sup> to study the possible reduction of the drag and lift forces acting on the body when the rigid wall is rotary oscillating around the axis of symmetry. Two parameters of the external forcing are varied, i.e. the amplitude of...
journal article 2016
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Mullyadzhanov, R (author), Palkin, Egor (author), Nićeno, B. (author), Vervisch, L (author), Hanjalic, K. (author)
We describe the low Mach variable-density Navier-Stokes numerical iterative solution procedure implemented in the finite-volume unstructured T-FlowS code. As the test cases we use a number of analytic manufactured solutions and Rayleigh-Taylor instability problem from the literature for algorithm verification purposes. The tests show that the...
journal article 2016
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Leschziner, M.A. (author), Hanjalic, K, (author), Rodi, W. (author)
journal article 2012
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Hanjalic, K. (author), Kenjeres, S. (author)
The paper reports on the application of the Time-dependent Reynolds-Averaged Navier-Stokes (T-RANS) approach to analysing the effects of magnetic force and bottom-wall configuration on the reorganisation of a large coherent structure and its role in the transport processes in Rayleigh-Benard convection. The large-scale deterministic motion is...
journal article 2011
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Kenjeres, S. (author), Verdoold, J. (author), Tummers, M.J. (author), Hanjalic, K. (author), Kleijn, C.R. (author)
The paper reports on numerical and experimental investigations of electromagnetically driven vortical flows of an electrically conductive fluid in a generic setup. Two different configurations of permanent magnets are considered: a 3-magnet configuration in which the resulting Lorentz force is focused in the wall-boundary layers, and a 2-magnet...
journal article 2009
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Kenjeres, S. (author), Hanjalic, K. (author)
This article reviews some recent applications of the transient-Reynoldsaveraged Navier–Stokes (T-RANS) approach in simulating complex turbulent flows dominated by externally imposed body forces, primarily by thermal buoyancy and the Lorentz force. The T-RANS aims at numerical resolving unsteady (semi-) deterministic vortical structures in flows...
journal article 2009
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Hanjalic, K. (author), Kenjeres, S. (author), Tummers, M.J. (author), Jonker, H.J.J. (author)
These lecture notes contain the course material Advanced Physical Transport Phenomena, offered in the Master’s programme in Applied Physics at Delft University of Technology. The notes follow in part the concept and content of the book Fysische Transportverschijnselen II (in Dutch) by Hoogendoorn and Van der Meer (Delft University Press, 1991)....
book 2009
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Verdoold, J. (author), Van Reeuwijk, M. (author), Tummers, M.J. (author), Jonker, H.J. (author), Hanjalic, K. (author)
journal article 2008
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Kenjeres, S. (author), Hanjalic, K. (author)
We report on hybrid numerical simulations of a turbulent magnetic dynamo. The simulated set-up mimics the Riga dynamo experiment characterized by Re ? 3.5 × 106 and (Gailitis et al 2000 Phys. Rev. Lett. 84 4365–8). The simulations were performed by a simultaneous fully coupled solution of the transient Reynolds-averaged Navier–Stokes (T-RANS)...
journal article 2007
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Popovac, M. (author), Hanjalic, K. (author)
journal article 2007
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Kenjeres, S. (author), Hanjalic, K. (author)
journal article 2007
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