A meshfree method for fully coupled analysis of flow and deformation in unsaturated porous media

2012 ◽  
Vol 37 (7) ◽  
pp. 716-743 ◽  
Author(s):  
A. Khoshghalb ◽  
N. Khalili
Keyword(s):  
Porous Media ◽  
Meshfree Method ◽  
Coupled Analysis ◽  
Unsaturated Porous Media ◽  
Fully Coupled ◽  
Fully Coupled Analysis

Global random walk solvers for fully coupled flow and transport in saturated/unsaturated porous media

2021 ◽  
Author(s):  
Nicolae Suciu ◽  
Davide Illiano ◽  
Alexander Prechtel ◽  
Florin Radu
Keyword(s):  
Finite Element ◽  
Porous Media ◽  
Random Walk ◽  
Transport Processes ◽  
Richards Equation ◽  
Unsaturated Porous Media ◽  
Coupled Flow ◽  
Flow And Transport ◽  
Coupled Flow And Transport ◽  
Fully Coupled

<p>We present new random walk methods to solve flow and transport problems in saturated/unsaturated porous media, including coupled flow and transport processes in soils, heterogeneous systems modeled through random hydraulic conductivity and recharge fields, processes at the field and regional scales. The numerical schemes are based on global random walk algorithms (GRW) which approximate the solution by moving large numbers of computational particles on regular lattices according to specific random walk rules. To cope with the nonlinearity and the degeneracy of the Richards equation and of the coupled system, we implemented the GRW algorithms by employing linearization techniques similar to the <em>L</em>-scheme developed in finite element/volume approaches. The resulting GRW <em>L</em>-schemes converge with the number of iterations and provide numerical solutions that are first-order accurate in time and second-order in space. A remarkable property of the flow and transport GRW solutions is that they are practically free of numerical diffusion. The GRW solvers are validated by comparisons with mixed finite element and finite volume solvers in one- and two-dimensional benchmark problems. They include Richards' equation fully coupled with the advection-diffusion-reaction equation and capture the transition from unsaturated to saturated flow regimes.  For completeness, we also consider decoupled flow and transport model problems for saturated aquifers.</p>

scholarly journals A fully coupled thermo-hydro-mechanical model for unsaturated porous media

2009 ◽  
Vol 1 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Weizhong Chen ◽  
Xianjun Tan ◽  
Hongdan Yu ◽  
Guojun Wu ◽  
Shanpo Jia
Keyword(s):  
Porous Media ◽  
Mechanical Model ◽  
Unsaturated Porous Media ◽  
Fully Coupled

Fully Coupled Analysis of Ship Motion and Sloshing Tanks in Regular and Irregular Waves

2018 ◽  
Author(s):  
Yuan Zhuang ◽  
Decheng Wan
Keyword(s):  
Open Source ◽  
Ship Motion ◽  
Irregular Waves ◽  
Coupled Analysis ◽  
Regular Waves ◽  
Wave Condition ◽  
Sloshing Phenomenon ◽  
Fully Coupled ◽  
Fully Coupled Analysis ◽  
External Wave

Fully coupled analysis of ship motion and sloshing tank in waves is essential for floating structures which store and transports natural gas. For partially filled tanks would generate violent sloshing due to external wave excitation, and the sloshing flow can consequently affect ship motion. Therefore, how to evaluate ship motion and sloshing phenomenon in tank is of great importance, especially under real sea state, when wave induced sloshing would be more complex than that under linear wave condition. In the present work, a CFD-based method is applied to simulate both external wave field and inner sloshing tank field in regular waves and irregular waves. The ship is a simplified FPSO, with two LNG tanks. All the numerical simulations are carried out by the in-house CFD code naoe-FOAM-SJTU, which is developed on the open source platform OpenFOAM. The regular and irregular wave condition is simulated based on open source toolbox waves2Foam. The main parameters of coupling effect of ship motion and sloshing tank, such as the time history of ship motion, sloshing phenomenon in tanks are obtained by our computations. The predicted results for the coupling effects of ship motion and sloshing tank in regular waves are compared with the corresponding experimental data. The comparison is satisfactory and shows that the CFD method has the ability to simulate coupling effects of ship motion and sloshing tank in waves.

Vortex Induced Vibration Analysis of a Complex Subsea Jumper

2010 ◽  
Author(s):  
Samuel Holmes ◽  
Yiannis Constantinides
Keyword(s):  
Complex Shape ◽  
Coupled Analysis ◽  
Eigenvalues And Eigenvectors ◽  
Element Analysis ◽  
Vortex Induced Vibration ◽  
Sea Floor ◽  
Curved Pipe ◽  
Design Analyses ◽  
Fully Coupled ◽  
Fully Coupled Analysis

Jumpers are typically short sections of curved pipe spanning production riser elements on the sea floor. When in areas of significant currents these jumpers are subject to vortex induced vibration (VIV). The complex shape of the jumper means that numerical methods are usually needed to solve for the vibration modes of the jumper. Furthermore, the fluid flow around the jumper is also complex so that traditional methods of VIV analysis used for risers are not applicable to jumpers. Here we use a CFD code in a fully coupled analysis to predict vibration response and strain of a typical subsea jumper. A separate finite element analysis is used to calculate the eigenvalues and eigenvectors of the jumper system for input into the CFD analysis. The resulting method is economical and practical for design analyses.

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