摘要:

AbstractIn this work, a hybrid scheme, analytical and numerical, is devised to solve the one‐dimensional hot water drive for secondary oil recovery problems. In our model capillary pressure and gravity are ignored. It is shown how when the oil viscosity variation as a function of temperature is specified the oil and water saturations may be found by numerical integration of a first‐order nonlinear hyperbolic equation which involves the fluid temperature. The numerical scheme makes use of ideas due to Meek and Norburry [8] and leads to a system of algebraic equations where only a single iteration is necessary to obtain a second‐order accurate (in time) approximation to the solution of the saturation equation. It is then shown that the fluid and also the solid temperature may be found analytically in terms of the solution to a Goursat‐problem. The integral representation of this problem is then evaluated numerically and used in the saturation e

ISSN:0044-2267    

DOI:10.1002/zamm.19840641202

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0044-2267    

DOI:10.1002/zamm.19840641204

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractIn der vorliegenden Arbeit wird eine geschwindigkeitsunabhängige, inkrementell nichtlineare, für große Deformationen gültige Materialgleichung für Sand vorgestellt. Der Zustand des Materials wird mit Hilfe von Zustandsvariablen beschrieben, deren Änderungen man während beliebiger Deformationsprozesse durch Evolutionsgleichungen ermittelt. Ergebnisse computersimulierter Versuche werden disk

ISSN:0044-2267    

DOI:10.1002/zamm.19840641206

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0044-2267    

DOI:10.1002/zamm.19840641211

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractApplying the moment method of H. Grad, a closed set of balance equations for density, momentum, angular momentum, stress and couple‐stress tensor, and heat flux is derived for a rarefied gas composed of non‐rigid dumb‐bell shaped particles. Averaging these equations over all values of size and orientation of the particles yields new balance equations governing the gas if the structure of the particles changes essentially faster than the position of their centres of mass. In a limiting case the volume viscosity is given in terms of the collision freq

ISSN:0044-2267    

DOI:10.1002/zamm.19840641212

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractAn analytical solution for the multi‐mass drive system considered in[1]is given, and necessary conditions of its stability are formulate

ISSN:0044-2267    

DOI:10.1002/zamm.19840641213

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0044-2267    

DOI:10.1002/zamm.19840641216

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractWe study the behaviour of the free boundary of the Crank‐Gupta model for the diffusion‐consumption of oxygen in a living tissue, assuming an initial condition corresponding to the stationary solution and with a decreasing input of oxygen at the fixed bound

ISSN:0044-2267    

DOI:10.1002/zamm.19840641217

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractIn this paper a numerical method is presented to solve a state‐constrained parabolic boundary control problem. The optimization technique is based on generalized bang‐bang‐properties of the optimal control, which were proved in earlier papers of the author. The effectivity of the corresponding algorithm is demonstrated by means of two examples, which were solved with high acc

ISSN:0044-2267    

DOI:10.1002/zamm.19840641218

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0044-2267    

DOI:10.1002/zamm.19840641219

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY