POINTWISE - IntroductionImport CASE file in Gambit and export MESH file (temporary) 18. EXAMPLE 2...
Transcript of POINTWISE - IntroductionImport CASE file in Gambit and export MESH file (temporary) 18. EXAMPLE 2...
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POINTWISE
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OUTLINE
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• Introduction
– Installation
– Advantages
• Pointwise Terminology
• Examples
– Flow over a sphere
– Shoulder mesh for blunt bodies
• Tips and Tricks
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INSTALLATION
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1. Go to the download page at:
www.pointwise.com
2. Follow installation instructions found on the same
download page
3. Specify license server:
shyylab.engin.umich.edu
Limited number of licenses (2 for both labs)
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ADVANTAGES
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• Better grid quality due to a mixture of automated mesh
generation and flexible manual controls
• Easier learning curve than Gambit
• Better product support
• Industry standard
Pointwise Gambit
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POINTWISE TERMINOLOGY
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Database – CAD geometry imported from other sources
or created directly within Pointwise (used to control the
shape of grid elements, but not necessary for mesh
creation)
Connector – a 1D grid element which forms the
foundation for all other grid hierarchy
Domain – a 2D grid element which can be structured or
unstructured
Block – a 3D grid element which can be structured,
unstructured or hybrid
Dimension – number of grid points assigned to a
connector
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EXAMPLE 1
FLOW OVER A SPHERE
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• Generate viscous grid for hypersonic flow over a sphere
(axisymmetric)
• Start with a Gambit grid (i.e. geometry)
• Example will cover:
– Importing geometry created in Gambit to Pointwise
– Generating a hexahedra grid in Pointwise (automatic
and manual options)
– Exporting a LeMANS-compatible mesh file
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1. Export IGES (geometry) file in Gambit:
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2. Import DATABASE (IGES file) in Pointwise:
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3. Modify DATABASE
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4. Create CONNECTORS
2-point connectors
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5. Dimension CONNECTORS
Number of points
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6. Distribute points along CONNECTORS
(a) Grid->Distribute
(b) Cluster points towards the wall
(c) Distance of 1st point from wall
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7. Assemble DOMAIN
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8. Modify DOMAIN grid using the solver
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9. Examine mesh quality (based on skewness equiangle)
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10. Set solver, boundary conditions and volume conditionsSolver: CAE -> Select Solver… -> ANSYS FLUENT
Boundary Conditions: CAE -> Set Boundary Conditions… -> New
Volume Conditions: CAE -> Set Volume Conditions… -> Check and select FLUID
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11. Export FLUENT CASE file (not compatible with LeMANS)
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12. Import CASE file in Gambit and export MESH file
(temporary)
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EXAMPLE 2
SHOULDER MESH FOR BLUNT BODIES
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• Manipulate Pointwise Solver options to improve grid
quality over MSL shoulder
• Edge attributes in solver allow the user to adjust the
spacing and angle between the boundary grid points and
the first layer of grid points inward from the boundary
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1. Assemble Domain:
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2. Modify Solver “Edge Attributes”:
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Spacing: InterpolateAngle: Interpolate
Spacing: Current GridAngle: Current Grid
Spacing: Current GridAngle: Orthogonal
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EXAMPLE 2
RESULTS
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With SolverWithout Solver
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TIPS & TRICKS
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• Elliptic solver floating boundaries –
produce domain interfaces with nice
orthogonality and distribution
• Examine rules – specify a set of “rules” to let Pointwise
alert you when certain grid quality criteria you set are no
longer met
• Bezier curves – give more control (control slope) and are
ideal for specifying farfield boundary curves that need to
be orthogonal to axis of symmetry
• Additional documentation can be found in your Pointwise
directory (i.e. /Pointwise/PointwiseVxxxx/doc)