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Showing 1 to 14 of 14 for “"incompressible fluid flow"”.
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Optimal Linear Feedback Control for Incompressible Fluid Flow
Linear feedback control is considered for large systems of differential algebraic equations arising from discretization of saddle point problems. Necessary conditions are derived by applying the Maximum Principle and have the form of constrained Riccati equations. We consider two approaches for …
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A Nodal Integral Method for the Numerical Solution of Incompressible Fluid Flow Problems
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Local Green's Function Techniques for the Solution of Heat Conduction and Incompressible Fluid Flow Problems
… to the numerical solution of heat conduction and incompressible fluid flow problems. In the solution of heat conduction problems, a local Green's function is used to develop a local integral equation for the pointwise temperature distribution within a computational volume element. These local …
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Mancais hidrostáticos aplicados em tornos de fabricação nacional
… as used in machine tools, particularly lathes. Incompressible fluid flow conditions and parameters are first studied and defined for the bearing system. A digital computer program is then presented, which is capable of determining bearing dimensions and hydraulic system characteristics.
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Boundary layer growth in a converging nozzle
A solution to the boundary layer equations for en incompressible fluid flow through a converging nozzle is presented. Calculations are based on a nozzle whose walls have a constant radius of curvature and a 2:1 entrance area to throat area ratio. An equation for the free stream velocity es a …
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Efficient Iterative Methods for Saddle Point Problems
… of time-dependent Navier-Stokes equations for incompressible fluid flow. These systems are indefinite due to a set of linear constraints on the velocity, causing difficulty for most preconditioners and iterative methods. A multilevel algorithm is proposed for the solution of such systems, which …
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Backward stochastic Navier-Stokes equations in two dimensions
… equations (BSNSEs, for short) corresponding to incompressible fluid flow in a bounded domain $G$ are studied in the second part. Suitable a priori estimates for adapted solutions of the BSNSEs are obtained which reveal a surprising pathwise $L^{infty}(H)$ bound on the solutions. The existence of …
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Stability of flows in channels
Laminar stability flow for incompressible fluid flow in two dimensional symmetric channels of variable width is reviewed through a survey of various related topics, Many authors whose works are reviewed here investigated linear stability using the "WKB' method in which regions of growth of a small …
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Numerical optimisation and theoretical analysis of complex microchannel heat exchangers
… heat transfer and steady state laminar incompressible fluid flow. Microchannel heat sinks used were numerically modelled from highly conductive (aluminium) solid material substrate. ANSYS FLUENT Response Surface Optimisation Tool (RSO) was used to numerically optimise and compare the …
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Finite element simulation of three-dimensional casting, extrusion and forming processes
… for the analysis of three-dimensional coupled incompressible fluid flow and heat transfer problems. The pressure is calculated by solving the momentum equation using known values of velocities, velocity gradients, and flow stresses from previous iteration. An iterative solution algorithm which …
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Leibniz-type rules associated to bilinear pseudodifferential operators
… Euler and Navier-Stokes equations (which model incompressible fluid flow, such as airflow over a wing) to Korteweg-de Vries equations (which model waves on shallow water surfaces). Bilinear pseudodifferential operators act to combine two functions using their Fourier transforms and a symbol, …
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Development of a high-order accurate reservoir simulator using spectral element method
… performance of a reservoir. Modeling multiphase fluid flow in porous media can be computationally challenging due to heterogeneous geologic features and sharp, moving fluid interfaces. Low-order convergence of conventional reservoir simulators, often based on finite volume or finite element …
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Splitting solution scheme for material point method
… another numerical instability present in nearly incompressible flow behaviours. This research considers an implicit treatment of the pressure in MPM algorithm to simu- late material incompressibility. The coupled velocity (v)-pressure (p) governing equations are solved by applying Chorin’s …