Spectral element technique for efficient parameter identification of layered media. Part III: viscoelastic aspects

2002 ◽  
Vol 39 (8) ◽  
pp. 2189-2201 ◽  
Author(s):  
R. Al-Khoury ◽  
A. Scarpas ◽  
C. Kasbergen ◽  
J. Blaauwendraad
Keyword(s):  
Parameter Identification ◽  
Layered Media ◽  
Spectral Element ◽  
Element Technique

Spectral element technique for efficient parameter identification of layered media

2001 ◽  
Vol 38 (48-49) ◽  
pp. 8753-8772 ◽  
Author(s):  
R. Al-Khoury ◽  
C. Kasbergen ◽  
A. Scarpas ◽  
J. Blaauwendraad
Keyword(s):  
Parameter Identification ◽  
Layered Media ◽  
Spectral Element ◽  
Element Technique

Two Dimensional Simulations of Enhanced Heat Transfer in an Intermittently Grooved Channel

2000 ◽  
Author(s):  
M. Greiner ◽  
P. F. Fischer ◽  
H. M. Tufo
Keyword(s):  
Heat Transfer ◽  
Local Heat Transfer ◽  
Spectral Element ◽  
Local Heat ◽  
Navier Stokes ◽  
Computational Domain ◽  
Two Dimensional ◽  
Number Range ◽  
Element Technique ◽  
Outflow Boundary

Abstract Two-dimensional Navier-Stokes simulations of heat and momentum transport in an intermittently grooved passage are performed using the spectral element technique for the Reynolds number range 600 ≤ Re ≤ 1800. The computational domain has seven contiguous transverse grooves cut symmetrically into opposite walls, followed by a flat section with the same length. Periodic inflow/outflow boundary conditions are employed. The development and decay of unsteady flow is observed in the grooved and flat sections, respectively. The axial variation of the unsteady component of velocity is compared to the local heat transfer, shear stress and pressure gradient. The results suggest that intermittently grooved passages may offer even higher heat transfer for a given pumping power than the levels observed in fully grooved passages.

Simulations of Three-Dimensional Flow and Augmented Heat Transfer in a Symmetrically Grooved Channel

2000 ◽  
Vol 122 (4) ◽  
pp. 653-660 ◽  
Author(s):  
M. Greiner ◽  
R. J. Faulkner ◽  
V. T. Van ◽  
H. M. Tufo ◽  
P. F. Fischer
Keyword(s):  
Three Dimensional ◽  
Spectral Element ◽  
Navier Stokes ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Transverse Grooves ◽  
Flow Transitions ◽  
Element Technique ◽  
Good Agreement

Navier-Stokes simulations of three-dimensional flow and augmented convection in a channel with symmetric, transverse grooves on two opposite walls were performed for 180⩽Re⩽1600 using the spectral element technique. A series of flow transitions was observed as the Reynolds number was increased, from steady two-dimensional flow, to traveling two and three-dimensional wave structures, and finally to three-dimensional mixing. Three-dimensional simulations exhibited good agreement with local and spatially averaged Nusselt number and friction factor measurements over the range 800⩽Re⩽1600. [S0022-1481(00)00904-X]

Computational poroelasticity — A review

Geophysics ◽  
2010 ◽  
Vol 75 (5) ◽  
pp. 75A229-75A243 ◽  
Author(s):  
José M. Carcione ◽  
Christina Morency ◽  
Juan E. Santos
Keyword(s):  
Porous Media ◽  
Wave Propagation ◽  
Rock Physics ◽  
Spectral Element ◽  
Seismic Modeling ◽  
Loss Mechanism ◽  
Diffusion Wave ◽  
Interface Waves ◽  
Element Technique

Computational physics has become an essential research and interpretation tool in many fields. Particularly in reservoir geophysics, ultrasonic and seismic modeling in porous media is used to study the properties of rocks and to characterize the seismic response of geologic formations. We provide a review of the most common numerical methods used to solve the partial differential equations describing wave propagation in fluid-saturated rocks, i.e., finite-difference, pseudospectral, and finite-element methods, including the spectral-element technique. The modeling is based on Biot-type theories of dynamic poroelasticity, which constitute a general framework to describe the physics of wave propagation. We explain the various techniques and discuss numerical implementation aspects for application to seismic modeling and rock physics, as, for instance, the role of the Biot diffusion wave as a loss mechanism and interface waves in porous media.

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