ANSYS CFD v14 Update Seminar - CAE Associates

66 Pages·2012·7.15 MB·English

ANSYS CFD v14
Update Seminar
© 2012 CAE Associates
ANSYS CFD v14
Meshing Update
© 2012 CAE Associates
Assembly Meshing
AAsssseemmbbllyy mmeesshhiinngg iiss aa ttoopp-ddoowwnn mmeesshhiinngg aapppprrooaacchh ttoo mmeesshh aallll ppaarrttss

Use of virtual bodies (material points) to extract flow regions from dirty geometry
—
Support for:
—
• MMeshhiing solliidds ffrom shheett bboddiies
• Conformal mesh between parts w/out having multi-body parts
• Support for overlapping bodies
Assembly
Capping
Face
Material
ppooiinntt
3
Assembly Meshing
AAsssseemmbbllyy mmeesshhiinngg rreeppllaacceess vv1133 CCuuttCCeellll MMeesshhiinngg aatt tthhee GGUUII lleevveell

Supports both CutCell and Tetrahedral meshes

CutCell meshing maintains characteristics from v13

High fraction of hex and prismatic cells
—
Supports global size functions, feature capture,
—
tessellation, etc. controls
Operates on parts, multi-body parts, etc. with new
—
option to define virtual bodies
Patch independent:
—
• EElliimiinattes tthhe needd ffor piinchh conttroll andd VVTT
operations
Creates conformal meshes across parts in contact

EElliimmiinnaatteess tthhee nneeeedd ffoorr mmullttii-bbooddy ppaarrtt ggeenneerraattiioonn iinn
—
CAD
Ability to create flow volumes from a “closed” set of

bbooddiieess ((sshheeeett oorr ssoolliidd))
Eliminates the need for Boolean/Fill operations in CAD
—
4
Assembly Meshing: Flow Volume Extraction
DDeeffiinnee CCoooorrddiinnaattee ssyysstteemm iinnssiiddee
11.
the Fluid Void
Insert a Virtual body
2.
AAssssiiggnn tthhee pprrooppeerr CCoooorrddiinnaattee
3.
System to the Material Point in the
details of the Virtual Body
DDoonnee
4.
#2
##33
#1
5
Assembly Meshing: Automatic Inflation
IInnffllaattiioonn llaayyeerrss ssuuppppoorrtteedd ffoorr VViirrttuuaall BBooddiieess

• Program controlled inflation acts only on Fluid Bodies
CutCell + Inflation Tetrahedron + Inflation
6
Assembly Meshing: Flow Volume Extraction
Maanaaggingg Virttuuaal Booddyy GGroouuppss:

A model where each void represents the same Fluid
—
• Same Virtual Body Group, but different Virtual bodies
• IInnsseerrtt NNeeww VViirrttuuaall BBooddiieess ffrroomm tthhee VViirrttuuaall BBooddyy GGrroouupp IIccoonn
A model where each void represents different Fluids
—
• DDiiffffeerreenntt VViirrttuuaall BBooddyy GGrroouupp
—New Virtual Body Group for each virtual Body
—Insert new Virtual bodies from the Geometry icon
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Assembly Meshing: Keep Solid Mesh
Parts can be
marked as
fluids/solids
8
Assembly Meshing Leak Handling: Leakage Path
FFiinndd lleeaakkss uussiinngg mmaatteerriiaall ppooiinnttss::

Any time you are using material points (for internal flow), and it is leaking to the
—
outside, you can automatically see the leak-path together with the surface
mesh
There is a small gap between the valve plug and the valve seat
9
Assembly Meshing Leak Handling:
Closing Leaks up to 1/5 of min size
Contact sizing: Three simple steps

Pick the face of the valve plug (blue)
Insert a Face-Face Contact between
1.
and the edge of the valve seat (red)
tthhee eennttiittiieess tthhaatt aarree lleeaakkiinngg
• Face/Face or Face/Edge
Drag and drop the contact on top of
2.
tthhee MMeesshh IIccoonn
• Creates a Contact sizing
#1
Adjust Contact sizing
3.
•• SShhoouulldd bbee bbiiggggeerr tthhaann tthhee ggaapp
— Limited to gaps up to 1/5 of
min-size
GGeenneerraattee MMeesshh
44..
#2
##33
10