Multiblock Computational Technologies Research Articles

Analysis of errors of multiblock computational technologies by the example of calculating a circulation flow in a square cavity with a moving cover at Re = 103

The errors of multiblock computational technologies realized in different versions of the VP2/3 package and involving the use of structured computational meshes of the H and O types with superposition were methodically investigated by the example of solving the problem on a circulation flow of an incompressible viscous fluid in a square cavity with a moving cover at a moderate Reynolds number of ~103. A comparison of the numerical estimations of the integral and extremum local characteristics of the indicated flow, made with the use of composite and multiblock meshes with varying densities and near-wall steps, has shown that it is reasonable to use multiblock computational technologies with linear interpolation in the calculations with conversion of parameters from mesh to mesh.

Modeling the structure of vortex zones between periodic superficially located energizers of the flow of a rectangular cross section

The mathematical simulation is presented of the structure of vortex zones between periodical superficially located turbulators energizing the flow of a rectangular cross section based on multiblock computational technologies. The calculations are based on the solution of the Reynolds equations factorized by the finite-volume method and closed by Menter’s model of the shear stress transfer and the energy equation on different-scale intersecting structured grids. This method had previously been successfully applied and experimentally verified in [1–4]. An exhaustive analysis of the corresponding flow lines is presented.

Development and verification of multiblock computational technologies for solution of unsteady problems of high building aerodynamics in the framework of URANS approach

Development and verification of multiblock computational technologies for solution of unsteady problems of high building aerodynamics in the framework of URANS approach

Simulation of the supersonic turbulent flow around a cylinder with coaxial disks

The turbulent axisymmetric flow around a stepped body — a cylinder with coaxial front and rear disks — has been calculated with the aid of a VP2/3 package based on multiblock computational technologies and the generalized procedure of pressure correction. The computational model has been tested with the example of a supersonic flow around a sphere. The numerical forecasts made with the use of Spalart–Allmares shear stress transfer and eddy viscosity transfer models have been compared with the data of the aeroballistic experiment, wind tunnel tests, and the results of the calculation of the flow around the disk–cylinder arrangement by a simplified zonal model in a wide range of variation of the incident flow Mach number (from 1.5 to 4). We have obtained a good agreement between the calculated transverse flow density distributions in the front stalling zone and those determined from the interferograms for the wave-drag-rational disk–cylinder arrangement. The influence of the rear disk on the drag of the disk–cylinder–disk arrangement has been estimated.

Whirlwind-Like Enhancement of Heat Transfer on Dimple Reliefs

Based on the use of multiblock computational technologies, a numerical investigation of whirlwind-like heat transfer in a turbulent flow past dimple reliefs on a plane wall, including narrow channels, is carried out. The algorithm and Menter's model of transfer of shear stresses are tested in a comparative analysis of predicted and experimental data for isolated dimples. The thermal efficiencies of a spherical dimple and of a two-dimensional notch on a plane wall are compared by varying their depths.

Numerical analysis of the influence of angle of attack on turbulent flow around a thick goettingen airfoil with vortex cells

On the basis of the solution by multi-block computational technologies of Reynolds equations closed with the aid of the equations of the model of Menter’s shear stresses transfer, an analysis of the flow around a thick airfoil of classical geometry with vortex cells is given at an arrangement of suction from the surface of central bodies placed inside them. The suction velocities, angles of attack, and location of vortex cells on the contour are determined, under which the flow around an airfoil of 35,2% thickness is ensured close to a separation-free flow, for high Reynolds numbers (Re = 105). The integral force characteristics of the Goettingen and EKIP profiles are compared for the distributed and concentrated suction in vortex cells.

Comparative Analysis of the Vortex Heat Exchange in Turbulent Flows around a Spherical Hole and a Two-Dimensional Trench on a Plane Wall

The vortex heat exchange in turbulent flows around a spherical hole and a transverse trench, identical in depth and in the shape of the middle cross section, on a plane wall has been numerically investigated using multiblock computational technologies. A factorized, implicit multiblock algorithm and a Menter's model of shear-stress transfer were tested in the process of comparative analysis of calculation and experimental data on flows around isolated holes.

Enhancement of vortex heat transfer in a bundle of transverse tubes with ordered trenches

Enhancement of vortex heat transfer in laminar and turbulent transverse flows past a remote circular cylinder in a bundle, with trenches periodically arranged on the cylinder surface, is analyzed numerically on the basis of multiblock computational technologies.

Calculation of nonstationary flow around a circular cylinder within the framework of multiblock computational technologies

A methodological numerical investigation of nonstationary flow of an incompressible viscous fluid around a circular cylinder has been carried out within the framework of the multiblock approach on a set of intersecting rectangular and cylindrical grids.