Essays about: "Unsteady flows"

Showing result 1 - 5 of 9 essays containing the words Unsteady flows.

  1. 1. Transonic Flutter for aGeneric Fighter Configuration

    University essay from KTH/Flygdynamik

    Author : Axel Bååthe; [2018]
    Keywords : Flutter; Aeroelasticity; Transonic; Unsteady Aerodynamics; Doublet-Lattice Method; Full-Potential Equation; PK-Method;

    Abstract : A hazardous and not fully understood aeroelastic phenomenon is the transonic dip,the decrease in flutter dynamic pressure that occurs for most aircraft configurationsin transonic flows. The difficulty of predicting this phenomenon forces aircraft manufacturersto run long and costly flight test campaigns to demonstrate flutter-free behaviourof their aircraft at transonic Mach numbers. READ MORE

  2. 2. CFD simulation of dip-lubricated single-stage gearboxes through coupling of multiphase flow and multiple body dynamics : an initial investigation

    University essay from Linköpings universitet/Mekanisk värmeteori och strömningslära

    Author : Nasir Imtiaz; [2018]
    Keywords : transmissions; churning losses; CFD; STAR-CCM ; FZG gearbox; planetary gearbox; RBM; MRF; unsteady framework; VOF; immiscible; overset meshing technique;

    Abstract : Transmissions are an essential part of a vehicle powertrain. An optimally designed powertrain can result in energy savings, reduced environmental impact and increased comfort and reliability. Along with other components of the powertrain, efficiency is also a major concern in the design of transmissions. READ MORE

  3. 3. ON SIMULATING COMPRESSIBLE FLOWS WITH A DENSITY BASED SOLVER

    University essay from KTH/Mekanik

    Author : Sathyanarayanan Chandramouli; [2016]
    Keywords : Coupled density based solver; High Pressure Turbine Nozzle Guide Vane;

    Abstract : A coupled density based solver in the framework of foam-extend is used to perform simulations of transonic flows. The solver is based on an explicit and time-accurate algorithm and is coupled to a compressible Unsteady Reynolds-Averaged Navier-Stokes (URANS) and a Large Eddy Simulation (LES) module. READ MORE

  4. 4. Vortex Shedding And Aerodynamic Drag On Truncated Trailing Edge Airfoil

    University essay from KTH/Flygdynamik

    Author : Koushik Bangalore Gangadharacharya; [2015]
    Keywords : ;

    Abstract : The thesis work content is to evaluate the use of more advanced turbulence models available in the ANSYS CFX software for aerodynamic calculations. In particular for flows over airfoils with thick trailing edges, the turbulence modeling is challenging to traditional methods, as both thin boundary layers as well as an unsteady wake needs to be well represented. READ MORE

  5. 5. Accuracy of transient versus steady state forces on a rudder operating in a propeller slipstream

    University essay from Umeå universitet/Institutionen för fysik

    Author : Erik Löfgren; [2015]
    Keywords : Unsteady flows; rudders; propellers; fluid mechanics; performance prediction; unsteady aerofoils;

    Abstract : In computational fluid dynamics (CFD), a transient simulation is in general more costly than computing the steady state of the system, if such a state exists. The velocity field produced by the propeller blades upstream of a rudder is transient in nature, and rudder design using CFD may therefore become very time-consuming. READ MORE