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  • 1
    Electronic Resource
    Electronic Resource
    Recent advances in numerical modelling of geomaterials (1991)
    Springer
    Meccanica 26 (1991), S. 93-99 
    Details
    ISSN: 1572-9648
    Keywords: Geomaterials ; porous media ; partial saturation ; numerical models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Geomateriali, cioè terre, rocce, calcestruzzi, sono modellati come mezzi porosi multifase, deformabili, composti quindi da una fase solida, da une fase liquida e/o una gassosa. I modelli relativi differiscono secondo il meccanismo di trasporto di massa che prevale ad alto, medio o basso contenuto d'acqua. Il metodo degli elementi finiti è utilizzato per la discretizzazione spaziale e temporale delle equazioni differenziali che governano il problema.
    Notes: Abstract Geomaterials are modelled as deforming multiphase porous media with a solid, liquid and/or gaseous phase. The models differ according to the mass transfer mechanism taking place at high, medium or low water content. The Finite Element Method is used for the discretization in space of the governing equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429874
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A coupled finite element model for the consolidation of nonisothermal elastoplastic porous media (1986)
    Springer
    Transport in porous media 1 (1986), S. 155-178 
    Details
    ISSN: 1573-1634
    Keywords: Three-field interaction problem ; temperature field ; flow field ; displacement field ; geothermal systems ; porous media ; elastoplastic analysis ; partitioned solution procedure ; fully coupled finite element models ; nonisothermal consolidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A coupled finite element model for the analysis of the deformation of elastoplastic porous media due to fluid and heat flow is presented. A displacement-pressure temperature formulation is used for this purpose. This formulation results in an unsymmetric coefficient matrix, even in the case of associated plasticity. A partitioned solution procedure is applied to restore the symmetry of the coefficient matrix. The partitioning procedure is an algebraic one which is carried out after integration in the time domain. For this integration, a two-point recurrence scheme is used. The finite element model is applied to the investigation of nonisothermal consolidation in various situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00714690
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Finite element modelling of two-phase heat and fluid flow in deforming porous media (1989)
    Springer
    Transport in porous media 4 (1989), S. 319-334 
    Details
    ISSN: 1573-1634
    Keywords: Finite elements ; consolidation ; porous media ; two-phase flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract This paper details a finite element model which describes the flow of two-phase fluid and heat within a deforming porous medium. The coupled governing equations are derived in terms of displacements, pore pressures and temperatures, and details of the time-stepping algorithm and thermodynamic considerations are also presented. Two numerical examples are included for verification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165778
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On augmented Lagrangian algorithms for thermomechanical contact problems with friction (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 2929-2949 
    Details
    ISSN: 0029-5981
    Keywords: contact ; friction ; augmentation ; thermomechanical coupling ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The detailed discretization of contact zones with contact stiffness based on real physical characteristics of contact surfaces can produce stiffness terms which induce ill-conditioning of the global stiffness matrix. Moreover the consistent treatment of frictional behaviour generates non-symmetric tangent stiffness matrices due to the non-associativity of the slip phase. Other non-symmetries are due to the coupling terms and to the dependencies on various parameters that can be involved. To overcome these difficulties almost consistent techniques based on two-step algorithms have been proposed in the past. Here an augmentation technique is proposed which takes into account micro-mechanical effects, and permits the symmetrization of the tangent stiffness during frictional slip phase.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620381706
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Subsidence above volumetric and waterdrive gas reservoirs (1981)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 1 (1981), S. 101-115 
    Details
    ISSN: 0271-2091
    Keywords: Subsidence ; Finite Elements ; Reservoirs ; Hydrocarbons ; Pore Pressure ; Consolidation ; Aquifer ; Waterdrive ; Permeability ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A fully coupled consolidation model has been developed for the simulation of the surface subsidence above gas reservoirs. The model is based on the Biot Theory and the material balance equation for hydrocarbon reservoirs. The model is extremely versatile and can handle such complex situations as vertical cross-sections where several gas reservoirs and aquifers are exploited at different levels. Computer runs were used to generate several reservoir formation profiles and the surface subsidence bowl for a variety of conditions. These results indicate the importance of various parameters which are disregarded in proelasticity models.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650010202
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    Paper (German National Licenses)
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