scholarly journals Mean force on a finite-sized rigid particle, droplet, or bubble in a viscous compressible medium

2015 ◽  
Vol 27 (10) ◽  
pp. 103304 ◽  
Author(s):  
Subramanian Annamalai ◽  
S. Balachandar
Keyword(s):  
Compressible Medium ◽  
Rigid Particle ◽  
Viscous Compressible Medium

scholarly journals On the Use of Probability-Based Methods for Estimating the Aerodynamic Boundary-Layer Thickness

Fluids ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 267
Author(s):  
Andrey V. Boiko ◽  
Kirill V. Demyanko ◽  
Yuri M. Nechepurenko ◽  
Grigory V. Zasko
Keyword(s):  
Boundary Layer ◽  
Software Package ◽  
Viscous Incompressible Fluid ◽  
Three Dimensional ◽  
Laminar Flows ◽  
Probabilistic Methods ◽  
Compressible Medium ◽  
Boundary Layer Stability ◽  
Turbulent Transition ◽  
Viscous Compressible Medium

In this paper, known probabilistic methods for estimating the thickness of the boundary layer of a two-dimensional laminar flow of viscous incompressible fluid are extended to three-dimensional laminar flows of a viscous compressible medium. Their applicability to the problems of boundary-layer stability is studied with the LOTRAN3 software package, which allows us to compute the position of laminar-turbulent transition in three-dimensional aerodynamic configurations.

Comparison of the numerical and self-similar solutions of Sedov’s problem on a point explosion in gas

2020 ◽  
Vol 15 (3-4) ◽  
pp. 212-216
Author(s):  
R.Kh. Bolotnova ◽  
V.A. Korobchinskaya
Keyword(s):  
Gas Dynamics ◽  
Numerical Solutions ◽  
Similarity Theory ◽  
Compressible Medium ◽  
Initial Moment ◽  
Point Explosion ◽  
Perfect Gas ◽  
Gas Dynamics Equations ◽  
Self Similar ◽  
Similar Solutions

Comparative analysis of solutions of Sedov’s problem of a point explosion in gas for the plane case, obtained by the analytical method and using the open software package of computational fluid dynamics OpenFOAM, is carried out. A brief analysis of methods of dimensionality and similarity theory used for the analytical self-similar solution of point explosion problem in a perfect gas (nitrogen) which determined by the density of uncompressed gas, magnitude of released energy, ratio of specific heat capacities and by the index of geometry of the explosion is given. The system of one-dimensional gas dynamics equations for a perfect gas includes the laws of conservation of mass, momentum, and energy is used. It is assumed that at the initial moment of time there is a point explosion with instantaneous release of energy. Analytical self-similar solutions for the Euler and Lagrangian coordinates, mass velocity, pressure, temperature, and density in the case of plane geometry are given. The numerical simulation of considered process in sonicFoam solver of OpenFOAM package built on the PISO algorithm was performed. For numerical modeling the system of differential equations of gas dynamics is used, including the equations of continuity, Navier-Stokes motion for a compressible medium and conservation of internal energy. Initial and boundary conditions were selected in accordance with the obtained analytical solution using the setFieldsDict, blockMeshDict, and uniformFixedValue utilities. The obtained analytical and numerical solutions have a satisfactory agreement.

Elbows for Accelerated Flow

1947 ◽  
Vol 14 (2) ◽  
pp. A108-A112
Author(s):  
G. F. Carrier
Keyword(s):  
Fluid Mechanics ◽  
Incompressible Fluid ◽  
Compressible Medium ◽  
Two Dimensional ◽  
Volume Relation ◽  
Accelerated Flow

Abstract It is of interest in the field of fluid mechanics to determine the shape of that two-dimensional channel which will most effectively turn a stream of fluid through an angle β while simultaneously increasing its velocity by a factor r. In the present paper, criteria which such a channel should satisfy are suggested and an elbow which meets these requirements is obtained. The solution is carried out first for a nonviscous incompressible fluid and then for the compressible medium using the Karmen-Tsien linearized pressure-volume relation.

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