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LINFLOW The Company

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LINFLOW 1.42 Why LINFLOW ? n Enables the Engineer to Efficiently: u 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). u 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) u 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 Solutions and FE-based Structure Dynamics.

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LINFLOW 1.43 Why LINFLOW Dynamics,1 n 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. u In an Eigenvalue Solution Characteristic Frequencies and Mode Damping Characteristics will Depend on: F Flow Velocity F Fluid Pressure Level F Gas/Liquid properties (Density etc.) Courtesy of FläktWoods AB, Sweden Instability Flow Velocity Dependent Damping Characteristics

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LINFLOW 1.44 Why LINFLOW Dynamics,2 n LINFLOW Extends Classic Aeroelastic Methods u BAH (Bisplinghof, Ashley and Halfman) Wing. F Transonic Jet Transport wing Structural Model Aerodynamic Model Description

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LINFLOW 1.45 Why LINFLOW Dynamics, 3 Pipe 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 Sub-Sea Example Description

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LINFLOW 1.46 Why LINFLOW Dynamics,4 n 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-stream the Fan Frequency Spectrum of the Pressure LINFLOW Fluid Dynamics Structural Response Description

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LINFLOW 1.47 Why LINFLOW Acoustics? n 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 Vibrating Tuning Fork. Acoustics in Landscape Without Wind Flow Direction Wind Acoustics with Wind

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LINFLOW 1.48 Why LINFLOW Fluid Dynamics ? if n Fast and Accurate Prediction of Steady and Unsteady (Oscillating) Fluid Dynamics 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 (Lift) and CD (Drag) Experimental Verification Many Hours in Modeling and Solution. Minutes in Modeling and Solution.

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LINFLOW 1.49 Conclusions n LINFLOW does: u Analysis of Dynamics Systems when the Structure is in Contact with an External and/or Internal Fluid (such as any Gas or Liquid). u Internal or External Acoustics Generated by the Vibrating Design, and May Include Flow Field Effects. u Steady and Unsteady (Oscillating) Fluid Dynamics.

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