pointwise - kth · quilts: grid regions on geometry surfaces imported from cad quilts simplify,...

PointwiseReliable CFD MeshingKTH-2017

Metacomp Technologies

Arnold Air Force Base

Ohio Northern Univ.

HYDAC USA

CRAFT Tech

Sinclair Knight Merz

Garry Rogers Motorsport

Structured

Unstructured

Hybrid

Native CAD

Plugin SDK

Glyph

Structured

Unstructured

Hybrid

Native CAD

Plugin SDK

Glyph

ACISCATIA V4CATIA V5

IGESNX

NastranPLOT3DParasolidPatran

Pro/EngineerSTEPSTL

SegmentSolidWorks

UCDUGRIDVRMLXpatch

…

Quilts: Grid Regions on GeometrySurfaces imported from CAD

Quilts simplify, capture features

Surface grids follow quilts

Sharp corners, transitions preserved in mesh

Defeaturing with Quilts

3 quilts (black, gray, green)Features inside quilt (green) approximated

Structured

Unstructured

Hybrid

Native CAD

Plugin SDK

Glyph

Structured

Unstructured

Hybrid

Plugin SDK

Native CAD

Glyph

Domain Algorithms and Cell Types

• Delaunay- Points recursively inserted

into domain to form triangles; Triangles combined for Triangles and Quadssetting.

• Advancing Front- Propagates layers of

equilateral triangles from boundaries into domain; Triangles combined for Triangles and Quads setting.

• Advancing Front Ortho- Right angle triangles

propagated from boundaries into domain; Triangles combined for Triangles and Quads setting.

Triangles Triangles and Quads

Delaunay

AdvancingFront

AdvancingFront Ortho

T-Rex Mixed Cell Domains

• This allows you to create the following combinations of domains:

- Triangular T-Rex cells with triangular isotropic cells (shown).

- Quad dominant T-Rex cells with triangular isotropic cells.

- Quad dominant T-Rex cells with quad dominant isotropic cells (shown).

Iso and T-Rex Triangles

Iso and T-Rex Quad Dominant

AdvancingFront Ortho

AdvancingFront

Delaunay

Anisotropic Refinement

Isotropic Refinement

Anisotropic: 6,300 cells

Isotropic: 34,000 cells

Structured

Unstructured

Hybrid

Plugin SDK

Native CAD

Glyph

Structured

Unstructured

Hybrid

Plugin SDK

Native CAD

Glyph

FDNS/UNICFieldViewFrontFlow

GASPINCA V2Kestrel

NASTRANNCC

NPARCNSAERONSU3D

OpenFOAMOverflowPATRAN

PHOENICSPLOT3DSCRYU

SC/TetraShipIR

SplitflowSTAR-CCM+

STAR-CDSTLSU2

TACOMATASCflow

TEAMTecplotTETREX

UCDUGRIDVRML

USM3DVSAEROWIND

WIND-USXPATCH

Plugins…

AcuSolveADPAC

ANSYS CFX

ANSYS FLUENTCFD++

CFDShip-Iowa

CFL3DCGNSCNSFVCobaltCOMO

CRUNCHDTNS

Exodus IIEdge

FALCONFANS

Structured

Unstructured

Hybrid

Overset

Native CAD

Plugin SDK

Glyph