ON NUMERICAL UPSCALING FOR STOKES AND STOKES-BRINKMAN FLOWS

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Presentation transcript:

ON NUMERICAL UPSCALING FOR STOKES AND STOKES-BRINKMAN FLOWS Scaling Up for Flow in Porous Media, October 13-18, 2008, Dubrovnik ON NUMERICAL UPSCALING FOR STOKES AND STOKES-BRINKMAN FLOWS Oleg Iliev, Z.Lakdawala, J.Willems, Fraunhofer Institute for Industrial Mathematics, Kaiserslautern, Germany V.Starikovicius, Vilnius Gediminas Technical University, Lithuania P.Popov, Inst. Scientific Computation, Texas A&M University, USA October 14, 2008

Content Motivation and aims Basic solver 3. Multiple scales. Subgrid approach 4. Computer simulations 5. Perspectives

1. Motivation and aims Motivation and aims

CFD simulations for filtration Main criteria determining the performance of a filter element: Pressure drop – flow rate ratio; Dirt storage capacity; Size of penetrating particles. depend on: microscale (e.g. fibrous geometry, local deposition of particles, etc), and macroscale (e.g., filter element geometry, pressure, velocity distribution, etc.)

Challenges to CFD simulations Multiple scales (particles, fibres, pleats, ribs, housing,…); Time-dependent performance; Shortening the design time and Needs for new design ideas; Virtual filter element design; Extensive computational time; Parameters measurement or calculation (permeability, deposition rate,..) Validation of the numerical simulation results; …

Multiple scales in filtration Particles level Filter components Filter element Complete system Nano scale Micro scale Millimeter Centimeter Meter (Navier-)Stokes in pore space coupled with stochastic ODE for particles, …. (Navier-)Stokes-Brinkmann in fluid and in porous media coupled with concentration of particles Particles-Fiber interaction Dirt loading of the filtering medium Pleats in cartrige filters Flow within Filter element Filter installation

2. Basic solver Basic solver

Basic CFD Solver: SuFiS Grids: Cartesian grid Finite volume discretization on cell-centred collocated grid Chorin projection method with implicit treatment of Darcy term Proper treatment of discontinuous coefficients in pressure- correction equation Subgrid approach incorporated Specialized for filtration applications Paralleization

Macro scale: Flow through fluid and porous regions Momentum Equations K can be fixed, or can change due to loading of the filtering medium Continuity Equation At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

Multiple scales. Subgrid approach

3. Multiple scales. Subgrid approach State of the art (Stokes to Darcy; Darcy to Darcy; two-level DD for multiscale) Microscale to mesoscale upscaling (Stokes to Darcy or to Brinkman) Mesoscale to macroscale upscaling (Brinkman to Brinkman)

3. Multiple scales. Known: Upscaling Stokes to Darcy +boundary conditions: periodic (Sanchez Palencia) const. velocity (Allaire) engineering approach At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

3. Multiple scales. Known: Darcy to Darcy +boundary conditions: periodic linear presure drop+oscilatory presure drop+Neumann At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations Note: Some results available for Macroheterogeneous case (block permeability, e.g., Wu, Efendiev,Hou)

3. Multiple scales. Brinkman to Darcy or Brinkman At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

Multiple scales. Subgrid approach Choose a basic grid on which the simulations are possible; Provide information about the fine geometrical details; For each grid cell check if it overlaps unresolved fine geometry details In marked cells (or their agglomeration) solve auxiliary problems on fine grid, and calculate effective permeability tensor; Solve the modified equations on the chosen grid (the fine details are accounted via the effective permeability). Example of selected location for which effective permeability is calculated

Multiple scales. Subgrid approach Usage of the subgrid approach: Upscale and solve upscaled equations; Upscale, solve upscaled equations and prolong the solution to the fine scale; Iterate over scales (two-level DD with upscaling-based coarse scale operator). Open problems: No theory for upscaling blocks containing solid, porous and fluid; No theory for macroheterogeneous case; …..

Computer simulations using subgrid approach

Pleated filter, simulations with subgrid approach 4. Computer simulations Pleated filter, simulations with subgrid approach

4. Computer simulations At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

Macro scale: Flow through fluid and porous regions At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

5. Perspectives Perspectives

Multiscale Microscale Macroscale Upscaling Downscaling Particles motion and deposition Permeability Electrical filed Upscaling Downscaling Navier-Stokes-Brinkman Stokes Microstructures: www.geodict.com Particles concentration Rate of deposition Filter elements design filtration (life time) filtration (clogging)

Thank you www.itwm.fhg.de Fraunhofer ITWM www.dasmod.de Dependable Adaptive Systems and Mathematical Modeling, TU Kaiserslautern

Simulation of Flow through a Filter: Flow Rate Simulation of 3-D flow through oil filters Simulation of Flow through a Filter: Flow Rate On the Picture: Mass flux through the upper surface of the porous filtering medium Observation: Inhomogeneus mass flux distribution --> Non- uniform loading of the filter An aim of simulations: Optimization of the performance of the filter

CFD simulation for filtration Filter Lower part of a filter housing Upper part of a filter housing Outlet Inlet Filtering medium

CFD simulation for filtration Visualization tool based on PV-4D (ITWM):

UPSCALING Multiscale Microscale Macroscale Navier-Stokes-Brinkman filtration (life time) Permeability Microstructures: image of samples (tomography) Design virtual microstructure www.geodict.com Thermal conductivity Effective mech. properties Stokes Elasticity Heat Eqn Particles motion Electrical filed Rate of absorption Navier-Stokes-Brinkman Darcy Biot (poroelasticity) Particles concentration Non-isothermal processes (clogging) Filter elements design UPSCALING efficient solvers

Mathematical model No F Note, permeability, capturing rate, etc.,may depend on time, loading, etc.: Here C is mass concentration of particles, Q is the amount of uploaded particles in the filtering medium etc.

Mathematical model No F Note, permeability, capturing rate, etc.,may depend on time, loading, etc.: Here C is mass concentration of particles, Q is the amount of uploaded particles in the filtering medium etc.

Fine-to-coarse upscaling Microscale Homogenization theory for periodic and statistically homogeneous media: Solve cell problem at microscale and use its solution to calculate effective coefficients of the macroscopic equation Permeability Microstructures: image of samples (tomography) Design virtual microstructure www.geodict.com Thermal conductivity Effective mech. properties Stokes Elasticity Heat Eqn UPSCALING efficient solvers Clogged nonwoven

Benefits of CFD simulations

Macro scale: Flow through fluid and porous regimes Momentum Equations Before: K was constant over all time iterations Continuity Equation Now: K changes according to the loading of the porous medium At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

Filter design simulation Simulation of complete filter system Efficient numerics for the coupled system: Navier-Stokes and Darcy/Brinkman Calculation of pressure distribution, velocities and particle concentrations in the complete filter including the filter media SuFiS: Filter design software for transmission filters (SPX/IBS Filtran) Optimization of filter housing geometry and position of stabilizing ribs and filter medium

Macro scale: Flow through fluid and porous regions At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations

Macro scale: Flow through fluid and porous regions At macroscale, the NSB system is considered! Previously, for clean fluids, this model was already successfully used in assisting the design of filter elements. This will be the basis of our macro-scale simulations