surface preparation and meshing - mdxmdx2.plm.automation.siemens.com/sites/default/files... ·...
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www.cd-adapco.com
Surface Preparation and Meshing
2012년 5월 8일
CD-adapco Korea
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Introduction
Surface Preparation
STAR-CCM+ 3D CAD Model
Indirect Mapped Interface
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Surface Preparation
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Workflow Overview[STAR-CCM]
STAR-CCM+ CFD 해석 과정
• 형상 데이터 불러오기
• 형상 수정 및 정리
– 형상수정이 필요한 경우(Surface Clean-up)
– Surface Organization
– 경계조건부여
• Meshing
– Meshing models 및 Properties 지정
– Generate volume mesh
• Physics & Solver
– Physics models및 Properties 지정
• 후처리[Post-processing] 준비
• 해석진행
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Requirements for Meshing
• STAR-CCM+에서 Volume Mesh 를 생성할 수 있는 Surface의 요구조건
– 각 영역(Region)은 내부 공간에서 볼 때 닫혀져 있는 조건일 것
– Surface에 아래와 같은 Error가 없을 것.
Self-intersecting
pierced faces
Non-manifold edges or vertices
Free-edge
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Surface Error Definitions
Self-intersecting / pierced faces
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Free edges
Non-manifold edges
Non-manifold vertices
Face quality
Face proximity
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Surface preparation – overview
Surface Error를 Repair Panel을 사용하여수정 할 수 있다.
• 선택한 Part 또는 Region에서 Repair Surface… Tool (RST) 을 준비합니다
– Surface Preparation Options 창에서 Parts(s)나 Region(s)을 선택 합니다.
• 어떤 Meshing 단계라도 RST(repair surface tool) 을
사용할 수 있다.
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Surface preparation – overview
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Surface Preparation
• Hole filling now able to retain
curvature in surface repair
– Additional option on top of existing
simple method
– Creates surface based on original
CAD definition
• Requires CAD association
– Imported CAD part or 3D-CAD
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Using Curvature Retention in Hole Filling
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3D-CAD Modeler
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3D-CAD Modeler What is 3D-CAD?
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3D-CAD Modeler What is 3D-CAD?
Create geometry Modify imported
geometry
Create shapes for mesh refinement or reporting surfaces
Editing incomplete CAD Models
3D-CAD
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3D-CAD Modeler Solid Modeling Features
Loft Options
•Simple loft
•Vertex match
•Multi-sketch
•Guide wires
Sweep Options
•Simple sweep
•Twist
•Scale
•Twist+Scale
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3D-CAD Modeler Pattern Feature
Linear Pattern Rotational Pattern
Cut
Merge
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Geometry
• 3D-CAD
– Sketch fillets & chamfers
» 두 개의 edge를 선택한 후 right-click
이름 및 치수 지정
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Geometry
• 3D-CAD
– Projection :
» 기존 스케치나 extrude된 feature에서 edge를 projection 할 수
있음
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Geometry
• 3D-CAD
– Sketch offset
» Offset Options
- Outward / Inward / Bi-directional
» Make Base construction
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Using Sketch Enhancements
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STAR-CCM+ V7.02 New Feature
Indirect Mapped Interface
Meshing Technology for CHT
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Mesh model in STAR-CCM+
• STAR-CCM+ Mesh technology
– Meshing 단계의 전자동화
– 다양한 Mesh model 지원
– 여러 가지 조합의 Mesh model 사용 가능
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Various Mesh Combination
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Original CAD
1.Polyhedral Mesh +
Prism Layer Mesh
4.Trimmed Mesh
+Tetrahedral Mesh
2.Polyhedral Mesh +
Embedded thin Mesh
3.Polyhedral Mesh + Extrude Mesh
+Trimmed Mesh
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What is the Interface
• 각 Multi-domain 간의 data 교환을 위해 생성되는 가상의 경계면
• Fluid-Fluid: Internal interface
– 내부의 질량과 에너지의 전송을 허용
• Fluid-Solid: Contact interface
– 내부의 에너지의 전송만을 허용
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Indirect Mapped Interfaces
• Interface type for CHT analyses - Allows for quick and reliable generation of
non-conformal interfaces
- Saves time at the surface preparation stage
- Designs may be easily changed and analyzed
• Leverages proven CAE mapping
technology
• Robust, high quality results for
non-conformal meshes
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Multi-Domain data transfer
• Conformal match in interface
– 각각의 도메인에 위치한 셀의 노드 포인트가 경계면 상에서 일치하며 데이터의 전송이 face to face로 1:1매칭이 됨
– Mesh의 다양성 확보에 제한점이 있음
» Mesh size의 제한
» Mesh type의 제한
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• Non-Conformal match in interface
– 각 도메인에 따라 Mesh type 및 크기를 다양하게 사용할 수 있음
– 복잡한 형상의 경우 Interface의 matching 여부에 따라 부정확한 결과가 도출
Multi-Domain data transfer
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Indirect Mapped Interface
• CHT 문제의 해석을 위한 STAR-CCM+ v7.02 새로운 기능
– Multi-region, non-conformal model에서 사용 가능
– Surface preparation 단계에서 시간 축소
– 검증된 CAE mapping 기술을 활용하여 계산결과의 정확성을 높임
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Example: Non-Conformal mesh
• Matching percentage: Master-84.77%
Slave-84.729%
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Tolerance value
0.05▷0.01
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Example: Indirect Mapped Interface
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Using Indirect Mapped Interfaces
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Question and Answer
질의 응답 질문에 대한 답변을 드리도록 하겠습니다.