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Showing 1 to 20 of 154 for “"Direct Numerical Simulation"”.
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Direct numerical simulation of human phonation
Open Restriction set for Item 105142 on 2019-01-22T15:34:03Z with date null by fschaef2@illinois.edu.
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Direct numerical simulation of viscoplastic particulate flows
… scale model in coarse grained suspension simulations. By restricting ourselves to quasi-steady, non-inertial, two-dimensional suspensions of infinite circular cylinders we are able to simulate suspension flows with two orders of magnitude more particles than in the literature. We first …
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Direct numerical simulation of droplet-laden isotropic turbulence
… main goal of this work is to investigate using direct numerical simulation (DNS) the physical mechanisms of droplet-turbulence interaction, both for non-evaporating and evaporating droplets. To achieve this objective, we develop and couple a new pressure-correction method with the …
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Meshless Direct Numerical Simulation of Turbulent Incompressible Flows
A meshless direct pressure-velocity coupling procedure is presented to perform Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) of turbulent incompressible flows in regular and irregular geometries. The proposed method is a combination of several efficient techniques found in …
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Direct numerical simulation of microjets for turbulent boundary layer control
A direct numerical simulation approach is used to simulate an array of MEMS slot jets in a turbulent boundary layer for the purposes of flow control. Initial studies were used to first ascertain the correctness of the model and give insight into the performance characteristics of the devices. To …
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Direct Numerical Simulation of Turbulence in a Model Solid Rocket Motor
The direct numerical simulation database is also used to make a priori estimates of the relative magnitudes of subgrid terms in the filtered evolution equations. It is found that in the equations for mean momentum and resolved scale Reynolds stress, the dominant subgrid terms are the subgrid stress …
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Transport processes in a direct numerical simulation of turbulent channel flow
A direct numerical simulation of fully-developed, time-dependent, three-dimensional turbulent flow in a channel is used to investigate turbulent transport processes. Detailed properties of the turbulent velocity field are presented. Three different transport processes are explored using this …
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Direct numerical simulation of large bubbles in a free shear layer
… in a free shear layer. This approach allows direct simulation of the multiphase flow by wholly incorporating the bubble flow field in conjunction with the large scale vortical structures of the liquid. The role of large bubbles in modifying finite Reynolds number shear flow structures was …
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Study of multi-component fuel premixed combustion using direct numerical simulation
… sub-model development and validation is based on Direct Numerical Simulation (DNS) studies. DNS however is computationally expensive. This, has so far limited DNS to single-component fuels such as methane and hydrogen. Furthermore, the majority of DNS conducted to date used one-step chemistry in …
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Study of flow past elliptic and circular cylinders using direct numerical simulation
… cylinders. Results of two- and three-dimensional simulations for a range of flow and geometric parameters are presented. The results are compared with available experimental and numerical data and it is found that important quantities like the Strouhal number and lift and drag coefficients match …
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Point source dispersion in a direct numerical simulation of turbulent channel flow
… scalar quantity from point sources located in a Direct Numerical Simulation of turbulent channel flow is studied. An algorithm for tracking fluid particles or molecular (or thermal) markers is developed and tested. Accurate estimates of a number of Lagrangian characteristics of the flow, …
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Direct Numerical Simulation of Flow Over Circular Cylinders for Large -Eddy Simulation Modeling
… of 1500 is studied using a three-dimensional direct numerical simulation (DNS). At this condition, the shear layer is unstable. However, previous direct numerical simulations of this flow have been limited to Reynolds numbers of 1000 or less, where the shear layer is stable or only weakly …
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Direct numerical simulation of an aerofoil at high angle of attack and its control
… conditions has been carried out by means of Direct Numerical Simulations. The stalled condition is either a steady configuration at a fixed angle of attack (α = 20o) or it is reached via a ramp-up manoeuvre, increasing the angle of attack from 0o to 20o. Concerning this last case, new …
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A Multi-Resolution Direct Numerical Simulation of Turbulent Stratified Flows with High Prandtl Numbers
… (𝑃𝑟) ranging 0.07 to 7, is investigated using direct numerical simulation (DNS). Most prior DNS studies of stratified turbulent open-channel flow have been limited to 𝑃𝑟 ≤ 1 due to computational constraints. To overcome the increased computational resources required to resolve the thermal …
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Direct numerical simulation of a tumbling short cylinder in low Reynolds number compressible flow
Limited Restriction Lifted for Item 50492 on 2016-09-22T20:59:06Z.
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A direct numerical simulation of fully developed turbulent channel flow with passive heat transfer
A direct numerical simulation of a fully developed turbulent channel flow with passive heat transfer is performed. The time-dependent three-dimensional Navier-Stokes equations and advection-diffusion equation are solved numerically using a pseudospectral technique with 1,064,960 grid points in …
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Statistical Analysis of High-Order Moments from Direct Numerical Simulation of a Turbulent Boundary Layer
… from flow field data from a finely resolved direct numerical simulation by the Universidad Politecnica de Madrid Fluid Dynamics Group. Fourth-order moment interrelations formed by invoking Millionshtchikov's hypothesis of quasinormality and fifth-order moment interrelations formed by …
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A novel state-space based method for direct numerical simulation of particle-laden turbulent flows
We developed a novel state-space-based numerical method for evolution of the particle density function, that describes particle-laden flows. The problem is stated purely in a deterministic Eulerian framework. The method is coupled to an incompressible three-dimensional Navier-Stokes solver. We …
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Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation
… effects of flow-thermal coupling at later simulation times on the reduction of panel drag and surface heat transfer are quantified. The second fluid-structure study investigates the interaction between a thin metallic panel and a Mach 2.25 turbulent boundary layer with an initial momentum …
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