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conical whirl (Precession) motion through mesh deformation technique |
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March 13, 2024, 03:35 |
conical whirl (Precession) motion through mesh deformation technique
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#1 |
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Boram Kim
Join Date: Mar 2024
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Hi, i have a problem with the following;
I'm trying to make conical whirl ( i added a picture for your understanding) motion through mesh deformation technique in journal bearing and seals. But it does not working.. i just keep making cylinerical motion T.T 1. Even though I try variously changing the options, the tilted axis is not adopted..it just show only cylinerical motion like pararell to global z axis. How do I make it rotate based on the new axis I created (coord 1.3)? 2. i want to make different motion at inlet and outlet(please refer to attatched picture) but i only kwow the way it rotate 3d surface through 'specified displacement'. How can i set the inner surfaces of the inlet and outlet seperatley move? conical whirl.jpg cylinderical whirl.PNG Sincerly BB |
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March 13, 2024, 06:02 |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
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Please attach your CCL.
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March 13, 2024, 21:09 |
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#3 |
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Boram Kim
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Please check the information below..!
FLOW: Flow Analysis 1 &replace DOMAIN: seal Coord Frame = Coord 0 Domain Type = Fluid Location = seal BOUNDARY: inlet Boundary Type = INLET Location = inlet BOUNDARY CONDITIONS: FLOW DIRECTION: Option = Normal to Boundary Condition END FLOW REGIME: Option = Subsonic END MASS AND MOMENTUM: Option = Static Pressure Relative Pressure = 6 [MPa] END MESH MOTION: Option = Parallel to Boundary END TURBULENCE: Option = Medium Intensity and Eddy Viscosity Ratio END END END BOUNDARY: outlet Boundary Type = OUTLET Location = outlet BOUNDARY CONDITIONS: FLOW REGIME: Option = Subsonic END MASS AND MOMENTUM: Option = Static Pressure Relative Pressure = 1 [MPa] END MESH MOTION: Option = Parallel to Boundary END END END BOUNDARY: rotor Boundary Type = WALL Create Other Side = Off Interface Boundary = Off Location = rotor BOUNDARY CONDITIONS: MASS AND MOMENTUM: Option = No Slip Wall Wall Velocity Relative To = Boundary Frame WALL VELOCITY: Option = Cartesian Components Wall U = Vx Wall V = Vy Wall W = 0 [m s^-1] END END MESH MOTION: Option = Surface of Revolution AXIS DEFINITION: Option = Coordinate Axis Rotation Axis = Coord 1.3 END END WALL ROUGHNESS: Option = Smooth Wall END END END BOUNDARY: stator Boundary Type = WALL Create Other Side = Off Interface Boundary = Off Location = stator BOUNDARY CONDITIONS: MASS AND MOMENTUM: Option = No Slip Wall Wall Velocity Relative To = Boundary Frame END MESH MOTION: Option = Stationary END WALL ROUGHNESS: Option = Smooth Wall END END END DOMAIN MODELS: BUOYANCY MODEL: Option = Non Buoyant END DOMAIN MOTION: Option = Stationary END MESH DEFORMATION: Displacement Relative To = Initial Mesh Option = Regions of Motion Specified MESH MOTION MODEL: Option = Displacement Diffusion MESH STIFFNESS: Option = Increase near Small Volumes Stiffness Model Exponent = 2.0 REFERENCE VOLUME: Option = Mean Control Volume END END END END REFERENCE PRESSURE: Reference Pressure = 1 [atm] END END FLUID DEFINITION: Fluid 1 Material = Air at 25 C Option = Material Library MORPHOLOGY: Option = Continuous Fluid END END FLUID MODELS: COMBUSTION MODEL: Option = None END HEAT TRANSFER MODEL: Fluid Temperature = 25 [C] Option = Isothermal END THERMAL RADIATION MODEL: Option = None END TURBULENCE MODEL: Option = SST END TURBULENT WALL FUNCTIONS: Option = Automatic END END END END |
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March 13, 2024, 22:06 |
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#4 |
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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If the axis of rotation does not change then I would not use a mesh motion approach, I would use a rotating frame of reference (with a transient rotor stator interface).
If the axis of rotation changes then you have to use moving mesh, but you have to define the motion of the boundaries yourself. For a whirling motion this will be complex function of the rotation combined with the whirl.
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annular seal, cfx, conical motion, journal bearing, mesh deformation |
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