Browsing by Author "Vartdal, Magnus"
Now showing items 1-9 of 9
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Comprehensive quasi-steady force correlations for compressible flow through random particle suspensions
Osnes, Andreas Nygård; Vartdal, Magnus; Khalloufi, Mehdi; Capecelatro, Jesse; Balachandar, S. (2023-04-26)Models for quasi-steady drag, quasi-steady drag variation, and transverse forces for compressible flows through random, fixed, particle suspensions are presented. Correlations are formulated using drag force measurements ... -
Computational analysis of shock-induced flow through stationary particle clouds
Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold; Reif, Bjørn Anders Pettersson (2019-03-22)We investigate the shock-induced flow through random particle arrays using particle-resolved Large Eddy Simulations for different incident shock wave Mach numbers, particle volume fractions and particle sizes. We analyze ... -
Computing turbulence structure tensors in plane channel flow
Vartdal, Magnus (2016)This paper is concerned with the computation of turbulence structure tensors in plane channel flow. It has been pointed out that the previously computed turbulence structure tensors, for this configuration, used an ... -
Development of LES inflow conditions for turbulent boundary layers
Wingstedt, Emma M. M.; Vartdal, Magnus; Osnes, Andreas N.; Tutkun, Murat (2013-10-31)Computational Fluid Dynamics (CFD) is currently the only known physically based method to model dispersion and transport of aerosols and gases in complex urban environments. One of the main challenges with CFD simulations ... -
Large-eddy simulations of dense-gas dispersion within a high-Reynolds number turbulent boundary layer
Wingstedt, Emma My Maria; Vartdal, Magnus; Reif, Bjørn Anders Pettersson (2017)Large-eddy simulations of flows over a backward-facing step with release of four different gases with increasing densities have been performed. The results have been analysed with particular emphasis on the part of the ... -
Linear motion of multiple superposed viscous fluids
Vartdal, Magnus; Osnes, Andreas Nygård (2019-04-16)In this paper the small-amplitude motion of multiple superposed viscous fluids is studied as a linearized initial-value problem. The analysis results in a closed set of equations for the Laplace transformed amplitudes of ... -
Particle-resolved simulations of shock-induced flow through particle clouds at different Reynolds numbers
Osnes, Andreas Nygård; Vartdal, Magnus; Omang, Marianne Gjestvold; Reif, Bjørn Anders Pettersson (2020-01-27)This study investigates the Reynolds-number dependence of shock-induced flow through stationary particle clouds at 10% volume fraction, using ensemble-averaged results from three-dimensional particle-resolved large eddy ... -
Performance of drag force models for shock-accelerated flow in dense particle suspensions
Osnes, Andreas Nygård; Vartdal, Magnus (2021-04)Models for prediction of drag forces within a particle cloud following shock-acceleration are evaluated with the aid of results from particle-resolved simulations in order to quantify how much the disturbances introduced ... -
Single-point structure tensors in turbulent channel flows with smooth and wavy walls
Yuan, Junlin; Mishra, Aashwin Ananda; Brereton, Giles; Iaccarino, Gianluca; Vartdal, Magnus (2019-10-06)A long-standing problem in turbulence modeling is that the Reynolds stress tensor alone is not necessarily sufficient to characterize the transient and nonequilibrium behaviors of turbulence under arbitrary mean deformation ...