Wingbody_ShellV12

8/10/2019 Wingbody_ShellV12

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WS3.2-1ANSYS, Inc. Proprietary

2009 ANSYS, Inc. All rights reserved.July 2009

Inventory #002664

Chapter 3

Shell Meshing

Workshop 2WingbodyF6 Model

ICEM CFD IntroductoryCourse


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Shel l Meshing Workshop 2



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Training ManualCreate Project / Open Geometry

File > New Pro ject

Enter the Wingbody

folder

Type

Wingbody-shel l_mesh

Save

File > Geometry >

Open Geometry

Select

F6_complete.t in

Open


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Training Manual

Need to set Mesh Methods,

Types and Sizes:

First set global settings

Mesh > Global Mesh Setup >

Global Mesh s ize

Set Max elementsize to 1000

Maximum allowable mesh size in

model

Set Max Sizeby parts as shown

in the table below

Mesh > Part Mesh Setup

Mesh Setup


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Training ManualSurface Mesh Parameters

Set default Mesh type and Mesh

method

Mesh > Global Mesh Setup > Shell

Mesh Parameters

Mesh type: Al l Tr i

Mesh Method: Patch Dependent

Set Shell Mesh ing Parameters

section to Patch Depend ent

Set Ignore size= 0.05

Apply

Force mapped mesh along

wing

Select Mesh > Surface

Mesh Setup Select 4 leading edge, and

2 thin trailing edge

surfaces as shown

Change Mesh methodto

Autob lock

Apply NONEmeans it will use the global setting


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Training ManualSet Curve Parameters

Set finer node distribution across leading edge Turn on all Parts

Turn on Curvesonly

Turn on Curve Node Spacing(right mouse select Curves)

Zoom toward front of WING where it meets the FAIRING

Select Mesh > Curve Mesh Setup

Change Method to Dynamic

Select Number of nodes

Position cursor on node number nextto curve shown

Increment number of nodes with left

mouse key to 11 (right = decrement)

Change Bunch ing lawto Geometr ic 1

Select Bunch ing ra tio and position

cursor near the same curve

Note the arrow which defines direction

from end spacing 1 to end spacing 2

We want to bias towards 2 (direction of

arrow)

Right mouse select until Geometr ic 2

appears

Increment with left mouse (over

number) to 1.2


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Copy same distribution to

opposing parallel edges

Still under Curv e Mesh Setup,

change Methodto Copy

Parameters

From Curveselect same

curve we just edited

To Selected Curve(s),select 5

curves shown across leading

edge

Middle mou se, then Apply

Some curves have a reversed

direction than the one we copied

from

In this case two bottom end curves

as shown

Go back to Dynamic method

Reverse (right mouse on curve) or

decrease Bunch ing ratio number

to 1.0

Bunching law changes to Geometr ic

1, when the ratio reaches 1

Left mouse key to increase to 1.2


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Make number of nodes equal

across parallel curves

Still in Dynamic method select

Number of nodes and change

curve towards middle bottom of

wing as shown to 6 (right mouse

to decrease) Node spacing turned off for clarity

Refine node distribution near the fuselage

nose Change Curve Mesh Setup Methodto General

Select front most curves along fuselage

shown

Middle mouse to accept selection

ChangeMaximum sizeto 5

Apply

This will give 32 + 6 -1 (shared node) = 37 nodes

Same as parallel ones

Better ensuring a mapped mesh

Also increase number of nodes along wing tip to

more closely match those along leading edge


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Training ManualCreate Surface Mesh

Mesh > Compute Mesh > Surface Mesh On ly

Select Geometry > Al l

Compute

Note bad quality surface mesh in front of

fuselage

Turn off FARFIELD part


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Training ManualDelete Mesh

Delete bad mesh

Turn off FARFIELD, INLET, OUTLET

To be able to select mesh behind them

Select Edit Mesh > Delete Elementsand

select one of the elements on each

surface as shown

Select up to a curvein Select m esh

elementstoolbar or ron the keyboard

to flood-fill all other elements on those

two surfaces

Flood fills to boundary curves making up

loop

Middle mouse or Apply


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Training ManualRe Mesh Two Surfaces

Remesh fuselage surfaces

Go back to Mesh > Global MeshSetup > Shel l Meshing Parameters

Turn on General > Respect L ineElements

To ensure new mesh is conformal withmesh on adjacent surfaces

Change Repair > Tryharder level to 3

Runs robust octree (patchindependent) method

Further down menu

App ly

Select Mesh Compute Mesh >Surface Mesh Only

Change Input to From Screen

Select geometry, then the twosurfaces, then middle mouse

Make sure to have surfaces turned on inModel tree

Compute


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2009 ANSYS Inc All rights reservedJuly 2009

Inventory #002664

Training ManualFinal Mesh

Observe revised surfacemesh

Note mapped (aligned)

mesh along leading edge

(front of wing)

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