Results 281 to 290 of about 1,892,200 (345)

Direct Numerical Simulation of Polycrystals

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2003
We propose a computational strategy for incorporating microstructural features in the calculation of the eective response of polycrystals. These features include grain orientation, shape and distribution, grain interaction and grain-boundary constraint eects that arise as a consequence of the elastic and plastic-slip anisotropy of the lattice.
Raul Radovitzky, Alberto Cuitino
openaire   +1 more source

Direct Numerical Simulations of Indoor Ventilation

2012
DNS of turbulent mixed convection in a complicated 3D-domain are performed with a fast fourth order finite-volume method using a separation of variables method together with the capacitance matrix technique. The method generally allows to use hexahedral computational meshes, which are non-equidistant in all directions and non-regular in any two ...
Shishkina, Olga, Wagner, Claus
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Direct numerical simulation of a recorder

The Journal of the Acoustical Society of America, 2013
The aeroacoustics of a recorder are studied using a direct numerical simulation based on the Navier-Stokes equations in two dimensions. Spatial maps for the air pressure and velocity give a detailed picture of vortex shedding near the labium. Changes in the spectrum as a result of variations in the blowing speed are also investigated.
openaire   +2 more sources

Computing Virtual Mass by Direct Numerical Simulation

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2001
AbstractBubbles resist acceleration with an apparent added mass. An improved knowledge of this virtual mass is desirable for accurate models of bubbly flows, for instance, in a two‐fluid‐model. A high‐resolution, two‐phase numerical code based on a volume‐of‐fluid method is used to compute the virtual mass of air and vapour bubbles in water.
Niemann, J., Laurien, E.
openaire   +1 more source

Direct Numerical Simulation of Supersonic Jet Flow

Journal of Engineering Mathematics, 1997
A numerical method is given for direct numerical simulation of the nonlinear evolution of instability waves in supersonic round jets, with spatial discretisation based on high-order compact finite differences. We analyse numerical properties of a class of symmetric and asymmetric schemes, and discuss the implementation of the Navier-Stokes equations in
Luo, K.H., Sandham, N.D.
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Receptivity by Direct Numerical Simulation

1994
Leading edge receptivity of a laminar boundary layer is investigated with Direct Numerical Simulation of a 2D incompressible flow. The code is written for the primitive variables calculated at the same collocation points. The equations are discretized with a second order scheme in time and in space.
G. Casalis, B. Cantaloube
openaire   +1 more source

Direct Numerical Simulation of Composite Structures

Journal of Composite Materials, 2002
Fiber-reinforced composites are not chemical compounds but physical mixtures of fiber and matrix, and the constituents are bonded together. Therefore, it is natural and essential to adopt a full microscopic model and directly analyze the model with no assumptions for local deformation or local loading conditions, in order to understand and predict not
Seung Jo Kim, Chang Sung Lee, Hea Jin Yeo, Jeong Ho Kim, Jin Yeon Cho   +4 more
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Direct Numerical Simulation of Detonation

AIP Conference Proceedings, 2006
The last decade has been witness to a thousand fold gain in computational power, in addition to comparable gains from improved computational algorithms such as adaptive mesh algorithms (AMR). But, even with these gains, there are many detonation phenomena which are beyond the current and foreseeable capabilities of direct simulation of resolved ...
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Numerical simulation of quantum directional couplers

Applied Physics A: Materials Science & Processing, 1997
A numerical analysis of a quantum directional coupler based on Π-shaped electron waveguides is presented with use of the scattering-matrix method. After the optimization of the device parameters, uniform output for the two output ports and high directivity are obtained within a wide range of the electron momenta.
Wei-Dong Sheng, Jian-Bai Xia
openaire   +1 more source

Direct numerical simulation of spiral turbulence

Journal of Fluid Mechanics, 2010
In this paper, we present results of three-dimensional direct numerical simulations of the spiral turbulence phenomenon in a range of moderate Reynolds numbers, in which alternating intertwined helical bands of turbulent and laminar fluids co-exist and propagate between two counter-rotating concentric cylinders.
Dong, S., Zheng, X.
openaire   +2 more sources