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LINFLOW 1.4
1The Company
LINFLOW 1.4 2
Why LINFLOW ?
Enables the Engineer to Efficiently: Study of His/Her Design Dynamics, if the
Structure is in Contact with an External and or Internal Fluid (such as any Gas or Liquid).
Study Internal and/or External Acoustics Generated by the Vibrating Design. This also when Taking into Account the Effect of a Non-Zero Mass Flow (e.g Wing Effect)
Predict Steady and Unsteady (Oscillating) Fluid Dynamics if Boundary Layers are Thin or have Small Influence on Overall Behavior.
An Efficient Complementary tool to Navier-Stokes Based Fluid Dynamic Solutionsand FE-based Structure Dynamics.
LINFLOW 1.4 3
Why LINFLOW Dynamics,1 Enable Study of Dynamics of the Design, When the Structure and the
Fluid is Considered as One Equation System. This is Called Aeroelasticity in Aeronautical Engineering.
In an Eigenvalue Solution Characteristic Frequencies and Mode Damping Characteristics will Depend on: Flow Velocity Fluid Pressure Level Gas/Liquid properties (Density etc.)
Courtesy of FläktWoods AB,Sweden
Instability
Flow Velocity Dependent Damping Characteristics
LINFLOW 1.4 4
Why LINFLOW Dynamics,2 LINFLOW Extends Classic Aeroelastic Methods
BAH (Bisplinghof, Ashley and Halfman) Wing. Transonic Jet Transport wing
Structural ModelAerodynamic Model
Description
LINFLOW 1.4 5
Why LINFLOW Dynamics, 3Pipe Example, Two Structural Mode Couple to Create a Fluid-elastic mode for the Structure with Internal Flow.
(Click on this Text for Animation)
Fan Example, Three Structural Modes Couple to Create a Fluid-elastic mode for the Structure with External Flow.
(Click on this Text for Animation) Description Description
Sub-Sea Example
Description
LINFLOW 1.4 6
Why LINFLOW Dynamics,4 Enable the Engineer to Study the Response of his/her Design due
to Structural and/or Fluid Dynamic Loading. Pressure in the Flow Field may Oscillate with Low and/or High Frequency and LINFLOW can then Calculate the Response of the Design.
Navier-Stokes Fluid Dynamics.
Time History of Pressure Up-streamthe Fan
Frequency Spectrum ofthe Pressure
LINFLOW Fluid Dynamics
Stress calc. location
Structural Response
Description
LINFLOW 1.4 7
Why LINFLOW Acoustics? Enables the Study of Internal or External
Acoustics Generated by the Vibrating Design. This also when Taking into Account the Effect of a Non-Zero Mass Flow (i.e Wing Effect)
Standard Acoustics of a VibratingTuning Fork.
Acoustics in Landscape Without Wind
Flow DirectionWind
Acoustics with Wind
LINFLOW 1.4 8
Why LINFLOW Fluid Dynamics ? Fast and Accurate Prediction of Steady and
Unsteady (Oscillating) Fluid Dynamics if if Boundary Layers are Thin or have Small Influence on Overall Behavior.
A Navier-Stokes Solution for the Flying Object
The LINFLOW Model
Velocity Field on the LINFLOW Model
CL and CD vs. AOA
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0 5 10 15 20
AOA (deg)
CL
an
d C
D
CL LINFCD LINFCL EXPCD EXP
CL (Lift) and CD (Drag) Experimental Verification
Many Hours in Modeling and Solution.
Minutes in Modeling and Solution.
LINFLOW 1.4 9
Conclusions LINFLOW does:
Analysis of Dynamics Systems when the Structure is in Contact with an External and/or Internal Fluid (such as any Gas or Liquid).
Internal or External Acoustics Generated by the Vibrating Design, and May Include Flow Field Effects.
Steady and Unsteady (Oscillating) Fluid Dynamics.