fulid-structure interaction webinar slides

7/25/2019 Fulid-Structure Interaction Webinar Slides

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Fluid-Structure Interaction

Andrew Young

Applications Engineer

COMSOL UK

Kyle Mucha

Marketing Manager

COMSOL UK

Copyright 2016 COMSOL. COMSOL, COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, COMSOL Server, and

LiveLink are either registered trademarks or trademarks of COM SOL AB. All other trademarks are the property of their

respective owners, and COMSOL AB and its subsidiaries and products are not affiliated with, endorsed by, sponsored by, or

supported by those trademark owners. For a list of such trademark owners, see www.comsol.com/trademarks
http://www.comsol.com/trademarkshttp://www.comsol.com/trademarks


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Agenda

Why Simulate? Simulating with COMSOL Multiphysics

Introduction to Fluid-Structure Interaction Poll Question

Fluid-Structure Interaction Interface Poll Question

Moving Mesh

Live Demo

Q&A

How To Try COMSOL Multiphysics

Contact UsFluid-StructureInteraction

windactingonsolar


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Why Simulate?

Conception and understanding Enables innovation

Design and optimization

Achieve the highest possible

performance

Testing and verification

Virtual testing is much faster thantesting physical prototypes

Fluid-StructureInteraction(FSI)int

andmoldofanaluminumextrus

process.


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Simulating with COMSOL Multiphysi

Electrical, mechanical, fluid, andchemical simulations

Multiphysics Include and couple all

relevant physical effects

Single physics in one integrated

environment

Cross-disciplinary product development


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Model Builder

Provides instantaccess to any of the

model settings

CAD/Geometry

Materials

Physics

Mesh

Solvers

Results

A Complete Simulation Environme

Graphics Window

Ultrafast graphic presentation,

stunning visualisation

COMSOL Desktop

Straightforward touse, the Desktop

gives insight and full

control over the

modelling process


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Application Design Tools

Simulation Application

Any COMSOL model can be turned into an

app with its own interface using the tools

provided in the Application Builder

Application Builder

Provides all the

tools needed to

build and run

simulation apps

Form Editor

Method Editor


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Run Applications

Simulation Apps

They can be run in a COMSOL Client for

Windows and major web browsers

COMSO

Its the e

running

apps and

controlli

deploym

distribut


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Product Suite COMSOL 5.2


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Introduction to Fluid-Structure Interactio

Examples of FSI analyses

CardiovPeristalticpump:Arollerpumpsfluid

alongaflexibletube.

Imagecredit:VerystEngineering.

Stirredmixingvessel.Theairflowaroundasolar

panelandtheresultant

structuralstressesare

computed.


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Examples of FSI analyses

Thesoundpressurelevelradiated

byaloudspeaker.

Introduction to Fluid-Structure Interactio

Thepressurefieldinalubricating

layeranddeformationofatilted

padthrustbearing.

Thestressesinthesoilandthefluid

velocityintheporoelasticdomain

Soli


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Types of FSI Problems in COMSOL

Fluid flow coupled with structural

deformation in solids

Acoustic-structure interaction

Porous Media and Poroelasticity

Particulate flow


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Particulate flow


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Particulate flow


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Particulate flow


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Poll Question 1


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Poll Question 1

What types of FSI application are you interested in?

Fluid flow coupled with structural deformation in solids


Porous media and poroelasticity

Particulate flow


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One-Way Coupling: Small Solid Displace

Automated solution steps:

Solve for fluid flow

Calculate total fluid stresses

Apply fluid stresses on solid boundaries

Solve for the displacements in solids Stressesinneonaresultofpressure

fluidflowinf


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One-Way Coupling: Rigid Structure

Automated solution steps:

Calculate displacements and rotations of the rigid

structure

Prescribe mesh motion according to rigid structure

Apply the velocity of the solid boundaries on the

fluid walls

Solve for fluid flowFluidvel

vesselasa


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Set up FSI equations for:

Fluid flow

Structural mechanics

Moving mesh

COMSOL automatically detects FSI boundary and sets conditions at FSI inte

Apply conditions at FSI interface:

Apply fluid boundary forces on solid boundary

Impose fluid boundary velocities based on velocity of solid boundary

Set boundary mesh displacement equal to displacement of solid boundary

Two-Way Boundary Coupling

Left:VelocitycontoursandVonMisesstressinvibratingbeam;Right:Meshdisplace


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Features Available for FSI Analysis

All solid and fluid capabilities in COMSOL Multiphysics are available for FSI a

FSI problems can also be coupled with any other physics field

Solid Capabilities

Large deformations

Contact

Shells

Plastic materials

Hyperelastic materials Geotechnical materials

Fluid Capabilities

Laminar flow

Turbulent flow

Stokes flow

Non-Newtonian fluids

Multiphase flow Thin fluid films

Peristalticpumpincluding2-

waycoupledFSIwithcontact


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Poll Question 2


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Poll Question 2

Which FSI coupling are you most interested in?

One way: Fluid flow Structural deformation

One way: Structural deformation Fluid flow

Two way: Structural deformation Fluid flow


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Moving Mesh: The Challenge

Mesh

vib

COMSOL automatically sets up additional PartialDifferential Equations (PDEs) for the mesh

movement

Mesh follows structural deformation at FSI

boundaries

Two main convergence issues:

Excessive mesh distortion

Fluid region collapsing due to contact


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Handling the Moving Mesh

Arbitrary Example: Solid object (purple) moves in fluid (pink) by displacement x(t

As solid deforms, the original mesh is distorted (in time) resu

excessive mesh distortion and convergence difficulties

Originalmeshatt=0s. Solidobjectdisplacement

describedby(t)

Meshquicklybecomes

distortedfort>0s.


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Helping the Mesh with Geometry Fea

Additional geometric features can be added to help solve the MPDEs:

Helps mesh deformation maintain quality

Easiest when displacement is known

e.g. on wall boundaries where normal mesh displacement is zero bu

can still slide


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Helping the Mesh with Geometry Fea

Additional geometric features can be added to help solve the MPDEs Even when displacement is not known!

Prescribe mesh translation based on how a point moves throu

coupling

Use Point Integration Component Coupling to allow helper lin

along boundary


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Automatic Remeshing

COMSOL provides several criteria for initiation of remeshing Default criterion is mesh distortion

Once threshold is me a new mesh is built on deformed geometr

Originalmeshatt=0s. Meshisdeformedafter

sometimetN,whereelementqualityisreduced

Meshisrebuilton

geometryatt=tN


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Live Demo: COMSOL Multiphysics


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How this Micropump Works

When flow is against the flaps, they bend

backward, narrowing the channel and

increasing flow resistance

When flow is in the direction of flap tilt, the

flaps bend forward, widening the channel

and decreasing flow resistance

By placing titled flaps on either side of the

inlet, the bending happens on opposite

sides out of phase, thereby pumping net

fluid to the right

Colourandarrowplotshowfluid


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Live Demo: COMSOL Multiphysics


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Why Use COMSOL Multiphysics for

Easy, automated setup of fluid, structure, and moving mesFSI problems including interface conditions

Extensive capabilities in structural mechanics, fluid flow, anmesh

Ease of interfacing with any other physics field Flexibility in solver selection including fully coupled direct

strongly coupled FSI problems

Powerful, easy-to-use design tool


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MultiphysicsSimulationStory:

SE FLOOR ENERGY H RVESTING

NAGI ELABBASI, BRENTAN ALEXANDER, AND STUART BRO

VERYST ENGINEERING, NEEDHAM, MA, USAExtract from COMSOL News 2011

2016 COMSOL. All rights reserved.

Velocity contours for a specific energy harvester configuration


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uk.comsol.com/blogs


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Q&A Session

Micropumpwithtwowaycoupledfluid

flowandstructuraldeformation


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Product Suite COMSOL 5.2


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