pointwise hybrid meshing webinar slides

8/3/2019 Pointwise Hybrid Meshing Webinar Slides

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Mastering Hybrid Meshing forHorizontal Axis Wind Turbines

This Webinar will begin at 11:00 am Central Time (4:00 pm GMT) on July 13, 2011. !You will be connected to audio using your computer's microphone and speakers (VoIP). A headset is

recommended. You also may select the “Use Telephone” option. Dial-in numbers are: !France: +33 (0) 182 880 270 !Germany: +49 (0) 892 2061 199 !United Kingdom: +44 (0) 203 535 0612 !United States: +1 609 318-0024 !Access Code: 424-045-339 !Audio PIN: Shown after joining the Webinar !Webinar ID: 525-554-622 !

System Requirements!PC-based attendees!Required: Windows® 7, Vista, XP or 2003 Server !Macintosh®-based attendees!Required: Mac OS® X 10.4.11 (Tiger®) or newer !



Dr. Rick Matus

Rick is Pointwise's vice president

for sales and marketing. Heearned both a B.S. and an M.S.

in aerospace engineering fromTexas A&M University in 1980and 1981, respectively, and a

Ph.D. in aerospace engineeringfrom the University of Texas at

Arlington in 1986. Prior toPointwise, Rick worked forFluent, Inc. and General

Dynamics.

Mr. Travis Carrigan

Travis works alongside Chris as a

technical sales engineer. Hecompleted his M.S. in aerospace

engineering at the University of Texas at Arlington in May 2011,where his thesis subject was

"Aerodynamic ShapeOptimization of a Vertical Axis

Wind Turbine." He received hisB.S. in aerospace engineering in2009 from UTA.

Dr. Chris Sideroff

Chris joined Pointwise in

September 2007 as a technicalsales engineer. He earned a B.S.

and M.S. in mechanicalengineering from the Universityof Alberta and a Ph.D. in

mechanical engineering fromSyracuse University in 2009.

Chris has prior industrialexperience with the NATCOGroup, ARV Development and

Harddata Ltd.

Your Presenters



Mastering Hybrid Meshingof Horizontal Axis WindTurbines

Chris Sideroff, PhD, Travis Carrigan and RickMatus, PhD



Sandia CX-100

• 9 m radius

• Sharp TE; no flat back

• Cut-off tip

• http://windpower.sandia.gov



Background

• HAWT generate power through lift

• Efficient designs have low drag

• Aero drag is created in two regions: BL and wake

• Resolving the BL and wake accurately are key

• How do I create a mesh that achieves this?



Mesh Topology

Structured Unstructured

• very high fidelity

• very time intensive• very little time

• low fidelity



Point EfficiencyFor a given # points, hex cells are more efficient

6136 points

11,910 cells

5381 points

5200 cells



Grid alignmentBody fitted structured meshes are more accurate



Grid AlignmentLess truncation error when faces aligned with flow gradients

Δy



Hybrid Topologies

• My boss told me I can only spend 1 day meshing

• When the flow path is unknown or changesrapidly, structured meshes lose their benefit

• Unstructured meshes provide more flexible

resolution control, i.e. localized clustering

• Hybrid meshes are a good compromise betweeneffort and accuracy – Prism/hex in important regions (BL’s, wakes, shocks, free-

surface)

– Unstructured elsewhere

When can I get away without using structured meshes?



Accuracy

Ease of Use

Multi-blockStructured

Unstructured

Credit: Tim Baker, “Mesh generation: Art or Science?” , Progress inAerospace Sciences 2005

Hybrid:Hex/Prism + Tet

Overset

Structured

Cartesian



Thank you for attending!

On Thursday, 14 July 2011, you will find the gridfiles and geometries used in this webinar as well asthe recorded video of the webinar on our web siteat www.pointwise.com/webinar.

If you have additional questions, please contactChris or Travis.

Email: [email protected] Call: 817-377-2807



Pointwise User Group Meeting ‘11

• Hands-on training with Pointwise V17

• Interact with CFD Experts from around the world

• Submit an abstract to present and attend for

free

• Register at www.pointwise.com/ugm

pointwise hybrid meshing webinar slides

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