the application of caeses from a perspective of a
TRANSCRIPT
The application of CAESES from a perspective of a propeller makerDavid Bendl, 2017-09-28
Voith Propulsion
VOITH CAESES | David Bendl | 2017-09-28 2
VLJ Integration Study
VOITH CAESES | David Bendl | 2017-09-28 3
VLJ Propulsion Arrangement
VOITH CAESES | David Bendl | 2017-09-28 4
inlet tunnel ShaftVLJoutlet tunnel
Geometry DefinitionIntegration Parameters
VOITH CAESES | David Bendl | 2017-09-28 5
VLJ integration depth
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°
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
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)
Geometry DefinitionRotor and Stator
VOITH CAESES | David Bendl | 2017-09-28 9
• view on the three cylinder sections
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
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
Geometry DefinitionNozzle and Shaft
VOITH CAESES | David Bendl | 2017-09-28 12
• shaft and hub complete propulsion line
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
Geometry DefinitionInlet Tunnel
VOITH CAESES | David Bendl | 2017-09-28 14
• tunnel is created as meta surface
Geometry DefinitionHull
VOITH CAESES | David Bendl | 2017-09-28 15
• hull has a generic shape that a simple integration
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
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
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
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 ...
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
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
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
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
Grid GenerationSurface Mesh
VOITH CAESES | David Bendl | 2017-09-28 24
Control VolumeBoundary Definition
VOITH CAESES | David Bendl | 2017-09-28 25
velocity inlet
pressure outlet
slip wall
noslip wall(rotational velocity)
Integration StudyIntegration Depth and Shaft Inclination
VOITH CAESES | David Bendl | 2017-09-28 26
VIT Hull Interaction Study
VOITH CAESES | David Bendl | 2017-09-28 27
VIT Interaction StudyBow Setup
VOITH CAESES | David Bendl | 2017-09-28 28
VIT Interaction StudyFlowparts (Tunnel Hull Transition)
VOITH CAESES | David Bendl | 2017-09-28 29
hull
flowpart
VIT
Geometry DefinitionHull and Flowpart Parameters
VOITH CAESES | David Bendl | 2017-09-28 30
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
Geometry DefinitionBow
VOITH CAESES | David Bendl | 2017-09-28 32
• a lofted surface connects the base curves
• side surfaces are simply extruded
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
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!)
Geometry DefinitionSupport Geometry
VOITH CAESES | David Bendl | 2017-09-28 35
• support curves are created based on brep edges
• they adapt to geometry changes
Geometry DefinitionSupport Geometry
VOITH CAESES | David Bendl | 2017-09-28 36
• support curves are created based on brep edges
• they adapt to geometry changes
Grid GenerationHull Control Volume (Structured Hexahedron Approach)
VOITH CAESES | David Bendl | 2017-09-28 37
Geometry DefinitionMesh Parameters
VOITH CAESES | David Bendl | 2017-09-28 38
Grid GenerationFlowpart Study
VOITH CAESES | David Bendl | 2017-09-28 39
Grid GenerationControl Volume
VOITH CAESES | David Bendl | 2017-09-28 40
Control VolumeBoundary Definition
VOITH CAESES | David Bendl | 2017-09-28 41
stat. pressure
slip wall
Rotor:noslip wall(rotational velocity)
stat. pressure
VOITH CAESES | David Bendl | 2017-09-28 42
Post ProcessingBow Study
Standard Report Resistance Calculation
VOITH CAESES | David Bendl | 2017-09-28 43
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
VOITH CAESES | David Bendl | 2017-09-28 45
VOITH CAESES | David Bendl | 2017-09-28 46
VOITH CAESES | David Bendl | 2017-09-28 47
VOITH CAESES | David Bendl | 2017-09-28 48
VOITH CAESES | David Bendl | 2017-09-28 49
VOITH CAESES | David Bendl | 2017-09-28 50
VOITH CAESES | David Bendl | 2017-09-28 51
Main Views
VOITH CAESES | David Bendl | 2017-09-28 52
VOITH CAESES | David Bendl | 2017-09-28 53
VOITH CAESES | David Bendl | 2017-09-28 54
Finished ReportExample
VOITH CAESES | David Bendl | 2017-09-28 55
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