Fluid Dynamics Engineering Services Outsourcing


Engineering Services Outsourcing Directory
  • Fluid Dynamics

  • Computational Fluid Dynamics
  1. CFD Analyses & Design
  2. Applied Optimization Techniques
  • Hydrodynamics
  1. Electrohydrodynamics
  2. Magnetohydrodynamics
  3. Quantumhydrodynamics
  • Aerodynamics
  1. Designed of G/A Propeller
  2. High Speed Train Aerodynamic Analysis, Noise & Sonic Boom
  3. Design of Liners For Mixers and Ejector-Suppressors
  • Thrust Reverser
  • Hemodynamics
  • Rheology

Case Studies

1.Fluid Dynamics Service - CAE ASSOCIATES

Company:The company specializes in providing solutions to engineering problems using FEA and CFD technology. CAE Associates provides a large number of CFD  modeling software solutions.

Case Studies

  • Aerodynamic Analysis of an Airbrake System
  • Combustion, Multiple Species & Chemical Reacting Flows
  • Fluid Structure Interaction (FSI)
  • Mixing Analysis
  • Moving Boundary / Moving Mesh Analysis
  • Multiple Phase Flows
Aerodynamic Analysis of an Airbrake System:This is a braking system used by heavy vehicles. The geometry includes an external housing, a butterfly valve, a leakage flow path (a small gap between the butterfly valve and the external housing), a by-pass flow path, and a by-pass valve. The valves are used to control the mass flow split into the leakage and by-pass flow paths.The inflow speed at the external housing inlet is about 10 m/s, and the inlet pressure is 5 atm. Roughly about 60% of the flow will pass through the leakage path, while the remaining enters the by-pass flow path. Because the leakage gap is extremely small, the incoming flow pressure is high enough to choke the gap. The flow then continues to accelerate to a maximum Mach number of 1.85 before expanding to the vast exiting region downstream of the butterfly valve. Throughout the domain, the maximum flow speed exceeds over 700 m/s. The resultant surface pressure information can be used to analyze deformation based on the uneven aerodynamics loading on various parts. The CFD analysis successfully provides critical three-dimensional flowfield information for design engineers to improve existing designs.

Combustion, Multiple Species & Chemical Reacting Flows:Combustor flowfield prediction presents one of the most challenging CFD applications. It involves multiple chemical species, fuel spray which involves two phase flow analysis with particle tracking, evaporation, momentum exchange with the mean flow, chemical reactions, premixed or diffusion flame zones, and the associated strong heat release. Each of the physics involves requires detailed understanding of the complicated flow physics as well as the chemical kinetics. Applications include gas turbine combustors, piston engine combustor, furnace, etc.With the advancement of CFD technology, analysis including the aforementioned phenomena has become an essential part of combustor designs.

Fluid Structure Interaction (FSI):Fluid structure interaction is one of most complex engineering analyses, coupling CFD and finite element structural and/or thermal analysis. In an FSI calculation, the solid surfaces act as interfaces between the fluid and solid domains to provide transfer of loads- mechanical or thermal. The CFD solution provides unsteady flowfield solutions for pressure or heat fluxes on solid surfaces, then the FEA solver calculates solid deformations or temperatures based on the CFD results. The deformed solid surfaces will in turn constitute a new boundary for CFD calculation, which leads to a different pressure or thermal loading. Thus, the FSI analysis requires a two-way interactions and a fully coupled iterative solution at each time level.

Mixing Analysis:Alternative mixing methods have been developed adopting a turbulent jet momentum mixing approach. Instead of the traditional rotor, a perforated disc moving up and down in the mixing tank creates jets through the holes to provide mixing effects. The CFD analysis for the mixer flowfield involves moving mesh / moving boundary for multi-component flows. The computational results are used provide design guidelines for parameters such as placement and sizes of the holes, size of the disc, moving speed, driving function, etc

Multiple Phase Flows:Multiple phase flows are often encountered in industrial systems. By definition, they are flowfields which involve more than single phase of fluid, such as gas-liquid or solid-gas flowfield. Oil-particle separators, vapor condensation, pump cavitation, inkjet droplet formation, trapped air pockets in fluid, and engine fuel sprays are good examples of multi-phase flows. Because of the complex physics of multiple phase flows, CFD has become an integral part of understanding and designing multiple phase flow systems.To analyze a multi-phase flow, the first step is to decide whether it should be modeled using a homogeneous or inhomogeneous multi-phase flow model. The homogeneous model assumes the fluids of different phases possess the same field solutions in pressure, temperature, velocity, etc. It is best to apply the homogeneous model to multi-phase flow with a clear distinction between the different phases, such as free surface flows.

Moving Boundary / Moving Mesh Analysis:In this analysis, the valve’s motion is either defined (controlled) or determined by the momentum balance between the incoming fluid and the valve control mechanism. The analysis starts with the computational mesh at its initial position. When the valve moves, the moving mesh algorithm will automatically move mesh nodes on the valve surface as well as the neighboring nodes to their new locations without user intervention. The opening and closing of the valve controls a certain amount of fluid passing through the control valve. The time-accurate solution is a result of the instantaneous valve location and its corresponding flowfield quantities. Based on this analysis, the engineer can properly determine design parameters like the mass flow rate per opening-closing cycle, the valve position control, etc.

Source:http://www.caeai.com/engineering-analysis-simulation-computation-fluid-dynamics.php


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