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The application of CAESES from a perspective of a propeller makerDavid Bendl, 2017-09-28
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Voith Propulsion
VOITH CAESES | David Bendl | 2017-09-28 2
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VLJ Integration Study
VOITH CAESES | David Bendl | 2017-09-28 3
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VLJ Propulsion Arrangement
VOITH CAESES | David Bendl | 2017-09-28 4
inlet tunnel ShaftVLJoutlet tunnel
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Geometry DefinitionIntegration Parameters
VOITH CAESES | David Bendl | 2017-09-28 5
VLJ integration depth
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Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 6
r/R [-]
• blade parameters are defined on cylinder sections [r/R]
• chord relative to diameter
• thickness, camber, skew, rake relative to chord
• pitch [°] normalized by 90°
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Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 7
• profile is generated on 2D plane (curve engine)
• subsequent block structured grid generation requires support geometry
• circle segment shows cylinder section for final profile position
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Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 8
• profile for three positions is shown (r/R = 0.4, 0.7, 1.0)
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Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 9
• view on the three cylinder sections
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Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 10
• based on the profile curve engine the whole blade is created as meta surface
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Geometry DefinitionNozzle
VOITH CAESES | David Bendl | 2017-09-28 11
• nozzle is a simple rotational body
• rotor and stator are positioned inside of the nozzle
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Geometry DefinitionNozzle and Shaft
VOITH CAESES | David Bendl | 2017-09-28 12
• shaft and hub complete propulsion line
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Geometry DefinitionInlet Tunnel
VOITH CAESES | David Bendl | 2017-09-28 13
• the circle’s axis is parallel to the rotor axis
• the circle’ axis defines a plane that intersects the following definition curves and creates three circle points: tunnel apex, side A and side B
• integration requires a inlet tunnel
• curve engine is a three point circle
tunnel apex
side A
side B
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Geometry DefinitionInlet Tunnel
VOITH CAESES | David Bendl | 2017-09-28 14
• tunnel is created as meta surface
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Geometry DefinitionHull
VOITH CAESES | David Bendl | 2017-09-28 15
• hull has a generic shape that a simple integration
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Geometry DefinitionHull and Inlet Tunnel
VOITH CAESES | David Bendl | 2017-09-28 16
• inlet tunnel geometry is combined with hull geometry
• all surfaces are combined to one brep
• no boolean operations are used � more stable
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Geometry DefinitionHull and VLJ Assembly
VOITH CAESES | David Bendl | 2017-09-28 17
• hull brep and VLJ brep are combine by booleanunion (careful base geometry definition assures success � tolerances)
• outlet tunnel is a simple extrusion of the nozzle’s outlet as a boolean difference
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Grid GenerationRotor and Stator (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 18
• rotor and stator mesh are created by Icem Hexa
• only one blade is meshed, whole rotor is defined rotated copies
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Grid GenerationRotor and Stator (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 19
• all the support geometry (curves and surfaces) are needed for ...
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Grid GenerationRotor and Stator (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 20
• ... the block structure of the hexahedron mesh
• circumferential symmetry is assured
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Grid GenerationRotor and Stator (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 21
• surface mesh has high density in regions of interest: leading edge, trailing edge, gap between nozzle and blade tip
• prism layer around all surfaces
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Grid GenerationHull Control Volume (Unstructured Polyhedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 22
• around the hull a half pipe control volume is created
• this region discretized by polyhedrons
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Grid GenerationHull and Control Volume (Unstructured Polyhedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 23
• complete control volume is created by extruding in- and outlet grid
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Grid GenerationSurface Mesh
VOITH CAESES | David Bendl | 2017-09-28 24
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Control VolumeBoundary Definition
VOITH CAESES | David Bendl | 2017-09-28 25
velocity inlet
pressure outlet
slip wall
noslip wall(rotational velocity)
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Integration StudyIntegration Depth and Shaft Inclination
VOITH CAESES | David Bendl | 2017-09-28 26
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VIT Hull Interaction Study
VOITH CAESES | David Bendl | 2017-09-28 27
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VIT Interaction StudyBow Setup
VOITH CAESES | David Bendl | 2017-09-28 28
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VIT Interaction StudyFlowparts (Tunnel Hull Transition)
VOITH CAESES | David Bendl | 2017-09-28 29
hull
flowpart
VIT
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Geometry DefinitionHull and Flowpart Parameters
VOITH CAESES | David Bendl | 2017-09-28 30
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Geometry DefinitionBow
VOITH CAESES | David Bendl | 2017-09-28 31
• bow geometry is based on simple three point b-spline curves
• facilitating Bow_SectionAngle, Bow_WaterlineAngle and Bow_FrontWidth
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Geometry DefinitionBow
VOITH CAESES | David Bendl | 2017-09-28 32
• a lofted surface connects the base curves
• side surfaces are simply extruded
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Geometry DefinitionFlowpart
VOITH CAESES | David Bendl | 2017-09-28 33
• flowpart and tunnel is created as one rotational brep
• the rotational brep is substractedfrom the hull brep
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Geometry DefinitionTunnel Hull Transition
VOITH CAESES | David Bendl | 2017-09-28 34
• Tunnel hull transition is created a linear edge fillet (huge benefit of breps!)
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Geometry DefinitionSupport Geometry
VOITH CAESES | David Bendl | 2017-09-28 35
• support curves are created based on brep edges
• they adapt to geometry changes
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Geometry DefinitionSupport Geometry
VOITH CAESES | David Bendl | 2017-09-28 36
• support curves are created based on brep edges
• they adapt to geometry changes
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Grid GenerationHull Control Volume (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 37
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Geometry DefinitionMesh Parameters
VOITH CAESES | David Bendl | 2017-09-28 38
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Grid GenerationFlowpart Study
VOITH CAESES | David Bendl | 2017-09-28 39
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Grid GenerationControl Volume
VOITH CAESES | David Bendl | 2017-09-28 40
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Control VolumeBoundary Definition
VOITH CAESES | David Bendl | 2017-09-28 41
stat. pressure
slip wall
Rotor:noslip wall(rotational velocity)
stat. pressure
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VOITH CAESES | David Bendl | 2017-09-28 42
Post ProcessingBow Study
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Standard Report Resistance Calculation
VOITH CAESES | David Bendl | 2017-09-28 43
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Automatic Latex Report CreationSupported by CAESES
VOITH CAESES | David Bendl | 2017-09-28 44
• standard tool in project work
• often tank test results are not available for power predictions of our propellers
• or changes / enhancement on the hull have to be evaluated
• standardized hydrostatics, mesh generation, CFD setup, post processing and reporting
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VOITH CAESES | David Bendl | 2017-09-28 45
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VOITH CAESES | David Bendl | 2017-09-28 46
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VOITH CAESES | David Bendl | 2017-09-28 47
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VOITH CAESES | David Bendl | 2017-09-28 48
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VOITH CAESES | David Bendl | 2017-09-28 49
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VOITH CAESES | David Bendl | 2017-09-28 50
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VOITH CAESES | David Bendl | 2017-09-28 51
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Main Views
VOITH CAESES | David Bendl | 2017-09-28 52
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VOITH CAESES | David Bendl | 2017-09-28 53
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VOITH CAESES | David Bendl | 2017-09-28 54
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Finished ReportExample
VOITH CAESES | David Bendl | 2017-09-28 55
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Conclusion
1. great tool – many possibilities (design studies, optimization and even different tasks)
2. excellent support – fast response on questions and also implementation of new features
3. main work horse – all our standard calculation are run through CAESES
VOITH CAESES | David Bendl | 2017-09-28 56
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