Showing papers in "Computers & Fluids in 1996"

TL;DR: In this paper, a priori analysis showed that the subgrid stress and the sub-grid energy flux predicted by the scale similarity model, and subgrid kinetic energy model (with fixed coefficients) correlate reasonably well with exact data, while the Smagorinsky's eddy viscosity model showed relatively poor agreement.

TL;DR: The nonlinear evolution of gas bubbles in the vicinity of a free surface is investigated numerically in this paper, where the flow is assumed to be potential and a boundaryintegral method is used to solve the Laplace equation for the velocity potential.

TL;DR: The structure of a parallel two-dimensional direct simulation code using detailed transport, thermodynamic and reaction models is described and a dynamic load-balancing procedure is implemented in order to optimize the distribution of the load among the different nodes.

TL;DR: Using the defect correction method (DeC), an implicit scheme is proposed that is second order accurate both in time and space, but that uses only first order jacobian.

TL;DR: In this article, the authors analyze inviscid aerodynamic shape optimization problems governed by the full potential and the Euler equations in two and three dimensions, and derive an estimate of the Hessian's condition number.

TL;DR: Simulations of turbulent channel flow indicate that the second-order central-difference scheme resolves the turbulent spectrum better than the high-order upwind schemes.

TL;DR: An incompressible flow solver based on unstructured grids is implemented on a parallel distributed memory computer architecture and Steady and unsteady flows over a tri-element airfoil and NACA0012 airfoils are computed using the parallel incompressable flow Solver.

TL;DR: A finite-difference scheme was used to evaluate the three-dimensional laminar flow past an array of uniformly distributed cells that are adherent to the bottom plate of a parallel-plate flow channel and indicated that fluid force on a spherical cell can be computed within 10% accuracy by using the solution given by Goldman et al.

TL;DR: The quadtree grid generation technique is reviewed and its programming discussed, and results from viscous flow and standing wave simulations are used to illustrate mesh adaptivity about internal and boundary features.

TL;DR: In this paper, numerical solutions of the incompressible Navier-Stokes equations are obtained for steady, laminar flows through 90-degree diversions of rectangular cross-section.

TL;DR: The development of a two-dimensional time-accurate dual time step Navier-Stokes flow solver with time-derivative preconditioning and multigrid acceleration is described, yielding second-order accuracy in space and time.

TL;DR: In this paper, the generalized integral transform technique (GITT) is employed to handle the steady two-dimensional incompressible Navier-Stokes equations in stream function-only formulation.

TL;DR: In this paper, the effects of the control surface deflection angle, leading edge shape and viscous interaction parameter on the flowfield have been evaluated by means of numerical simulations and theoretical considerations.

TL;DR: In this article, the authors compared experimental data for the bubble mode of breakdown in pipe flows with calculations of the axisymmetric form of the Navier-Stokes equations.

TL;DR: In this article, the authors provided and validated a numerical procedure for the calculation of turbulent separated flow and heat transfer characteristics in axisymmetric expanding ducts, with emphasis on the annular diffuser geometry.

TL;DR: In this article, the interactions of vortex-induced vibrations of a circular cylinder and a steady approach flow at a Reynolds number of 13,000 have been studied by numerical solutions of the stream-function/vorticity formulation of the two-dimensional incompressible Navier-Stokes equations with a large eddy simulation for the turbulence in the wake.

TL;DR: In this article, a turbulent flow over a two-dimensional cavity has been analyzed through solutions of the Reynolds-averaged Navier-Stokes equations, and the effects of turbulence were modelled through a coupled solution of a k-ω turbulence model using compressibility corrections.

TL;DR: In this paper, the authors present benchmark results from the parallel implementation of the three-dimensional Navier-Stokes solver Prism on different parallel platforms of current interest: IBM SP2 (all three types of processors), SGI Power Challenge XL and Cray C90.

TL;DR: An improved multistage time stepping for second-order upwind TVD schemes to compute the Euler equations is suggested by splitting the residual into the first-order flux and the antidiffusive terms as discussed by the authors.

TL;DR: In this paper, a pressure-correction method using a non-orthogonal grid was investigated, and two alternative interface treatments for the pressure correction equation, one employing the Neumann boundary condition in both grid blocks and the other utilizing Neumann-Dirichlet boundary conditions, allowing the interface condition in one block to be derived by interpolating the pressure field from the adjacent block, were assessed.

TL;DR: In this article, the authors investigated the behavior of an incompressible Newtonian fluid downstream of a plane symmetric channel expansion in order to determine the critical value of the Reynolds number, above which the flow becomes asymmetric with respect to the channel geometry.

TL;DR: In this paper, the Navier-Stokes equations and the standard two-equation k-ϵ turbulence model were used to calculate the viscous flow within a backswept centrifugal impeller at the design point.

TL;DR: In this article, a full Reynolds-stress-transport model has been incorporated into a general 3D non-orthogonal finite-volume solver and applied to two representative 3D flows, one in a circular-to-rectangular transition duct and the other around a streamlined body at high incidence.

TL;DR: In this paper, the stability of interpolation for one-dimensional overlapping grids is considered and the existence of generalized eigenvalues is demonstrated for some rare overlap parameters, in which cases the discretization of the corresponding strip problem is found to be unstable.

TL;DR: Comparison between the proposedMultigrid method and conventional multigrid methods shows that the proposed formulation for the coarse-grid equations can substantially improve the multigrids efficiency for certain configurations and Reynolds numbers.

TL;DR: In this article, the problem of determining airfoils that approximate, in a least square sense, given surface pressure distributions in transonic flight regimes is solved by an adjoint-based minimization algorithm.

TL;DR: In this paper, the parabolic vorticity transport equation and the elliptic equations for the velocity components are discretized in time using a two level implicit Euler scheme and in space using a staggered-grid finite volume discretization.

TL;DR: A finite-volume approach is used to discretize the conservation law form of the compressible flow equations written in terms of primitive variables and temporal preconditioning is employed so that low Mach number flows can be solved economically.

TL;DR: In this article, a spectral collocation domain decomposition method is developed for numerical solution of second and fourth-order problems in circular domains and applied to the Navier-Stokes equations.

TL;DR: In this article, an implicit upwind symmetric factorization finite volume solver for the conical Navier-Stokes equations was used to compute asymmetric vortices about a 5 ° cone at a 20 ° angle of attack.