Browsing by Author "D.D. Tripathi"

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A class of exact solutions and physical behaviour of magnetic field lines in plasma column
(Springer India, 1988) S.N. Singh; D.D. Tripathi
Using hodograph and Legendre transformation functions the basic equations are recast in terms of this function, and the conditions which this function should satisfy are stated. Several applications of this method are considered, and the geometry of magnetic field lines is discussed. © 1988 Indian Academy of Sciences.
A composite stellar model of geostrophic flows I
(Kluwer Academic Publishers, 1987) H.P. Singh; D.D. Tripathi; S.C. Singh; R.B. Mishra
This paper has been presented the geometric study and solutions of the electromagnetogeostrophic flows, and spatially the geometry of magnetic and current lines are discussed. © 1987 D. Reidel Publishing Company.
A composite stellar model of geostrophic flows II
(Kluwer Academic Publishers, 1988) H.P. Singh; D.D. Tripathi; S.C. Singh; R.B. Mishra
This paper contains a geometric study and solutions of the electromagneto-geostrophic flows, and spatially the geometrical treatments of magnetic field lines are discussed. © 1988 Kluwer Academic Publishers.
A composite stellar model of magnetofluid continuum via anholonomic descriptions
(Kluwer Academic Publishers, 1988) H.P. Singh; D.D. Tripathi; R.B. Mishra
A theoretical analysis based on the equations of magnetofluid-dynamics is undertaken, in order to completely classify the geometry of the motion admitted by this pattern. © 1988 Kluwer Academic Publishers.
A symmetric study of MHD equilibrium with numerical applications
(1988) H.P. Singh; D.D. Tripathi
[No abstract available]
Finite-difference methods for boundary value problems at high Grashof number
(1987) H.P. Singh; D.D. Tripathi; R.B. Mishra
The free convective boundary layer flow over the surface of a sphere whose temperature is suddenly raised to a value greater than its surroundings, is considered. Numerical solutions of the boundary layer equations are presented which give a complete description of the flow and which confirm the appearance of a singularity in the solution at the upper pole after a finite time. © 1987.
Geometrization of magnetohydrodynamic equations via lie groups
(Kluwer Academic Publishers-Plenum Publishers, 1987) H.P. Singh; D.D. Tripathi; R.B. Mishra
The equations of magnetohydrodynamics of a perfect fluid are classified with respect to the Coriolis parameter, and all essentially different solutions of rank one are indicated. The geometry of streamlines is discussed. © 1987 Plenum Publishing Corporation.
Hodograph transformation in steady plane rotating MHD flows
(Martinus Nijhoff, The Hague/Kluwer Academic Publishers, 1987) S.N. Singh; D.D. Tripathi
A hodograph transformation is employed to obtain a partial differential equation of second order which is exploited to obtain solutions for plane rotating viscous incompressible flows with orthogonal magnetic and velocity fields. Lastly radial and vortex flows are discussed. © 1987 Martinus Nijhoff Publishers.
On magnetohydrostatic configuration with lamellar current density
(1988) S.N. Singh; D.D. Tripathi
A theoretical study of magnetohydrostatic configuration with lamellar current density is made and it is shown that field lines are (i) parallel straight lines having constant current density and (ii) particular circular helices.
Physical study of steady electromagnetofluid-dynamic viscous flows
(1988) H.P. Singh; D.D. Tripathi; R.B. Mishra
This paper presents a geometric study and solutions of the electromagnetofluid-dynamic (EMFD) flows. On the basis of the reduced fundamental equations the fascination of charge, solutions and circulation-preserving EMFD flows have been discussed. © 1988.
Rotational circulation-preserving magnetogeostrophic flows
(Kluwer Academic Publishers, 1987) H.P. Singh; D.D. Tripathi; R.B. Mishra
It has been shown that the only steady, inviscid, magnetogeostrophic rotational circulation-preverving motion whose magnetic field line pattern is that of the irrotational motion is a complex-lamellar motion whose magnetic field magnitude bears a constant value on a magnetic field line. © 1987 D. Reidel Publishing Company.
Structure of a point heat source near an interface
(1987) H.P. Singh; D.D. Tripathi; R.B. Mishra
An asymptotoc solution of a hydromagnetic flow problem near a point heat source, which is governed by the Oseen Boussinesq approximation, is presented. Two cases are discussed in particular, one which involves a motion of the heat source beneath a free surface and othernear a rigid boundary. The thermal boundary conditions on these two interfaces are assumed to be that of the mixed Cauchy type. Closed form expressions are obtained for the temperature field distributions in the fluid. The general solution thus obtained is illustrated by calculating both the thermal and kinematic signatures on the free surface for some particular cases. © 1987.
The development of circulation-preserving MHD flows via spherical mapping
(1988) H.P. Singh; D.D. Tripathi; H.K. Pandey
It has been claimed to be a conclusion attributed to Yin that circulation-preserving motion does not accelerate in a magnetic field. The results of this paper disprove this claim, and many physical interpretations of flow pattern are specified. © 1988.
The geometry of magnetic fieldlines in magnetogeostrophic flows
(Kluwer Academic Publishers, 1987) S.N. Singh; B.P. Singh; D.D. Tripathi
It is proved that the only circulation preserving magnetogeostrophic flows whose current density is lamellar, and bears a constant on a current density vector have (1) a plane motion of constant current density (on which certain unsteady potential motions may be superposed) and (2) a particular circular helical motion. © 1987 D. Reidel Publishing Company.
The structure of magnetized rotating polytropes
(1987) H.P. Singh; D.D. Tripathi; R.B. Mishra
The structure of rapidly rotating magnetized polytropic models, with polytropic indices n = 1.5, 2 and 3 have been discussed by using Chandrashekhar's perturbation techniques for inner solutions. The solutions have been fitted at the points ξf = 2.025, 3.470, and 3.950 for n = 1.5, 2 and 3, respectively. These interfacial points have been chosen to minimize the differences between values of neglected terms of inner solution at the interfaces. © 1987.