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CFD-Wiki - User contributions [en]
2024-03-29T13:58:48Z
From CFD-Wiki
MediaWiki 1.16.5
https://cfd-online.com/Wiki/Ansys_FAQ
Ansys FAQ
2005-12-13T03:49:23Z
<p>Qolyan: </p>
<hr />
<div>This section is empty. This is just a suggestion on how to structure it. Please feel free to add questions and answers here!<br />
<br />
== CFX-5 ==<br />
<br />
=== Question 1 ===<br />
<br />
Answer 1<br />
<br />
=== Question 2 ===<br />
<br />
Answer 2<br />
<br />
== ICEM CFD ==<br />
<br />
[[Category: FAQ's]]<br />
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{{Stub}}<br />
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Qolyan
https://cfd-online.com/Wiki/Numeca_FAQ
Numeca FAQ
2005-12-13T03:49:18Z
<p>Qolyan: </p>
<hr />
<div>This section is empty. This is just a suggestion on how to structure it. Please feel free to add questions and answers here!<br />
<br />
== FINE/Turbo ==<br />
<br />
=== Question 1 ===<br />
<br />
Answer 1<br />
<br />
=== Question 2 ===<br />
<br />
Answer 2<br />
<br />
== HEXPRESS ==<br />
<br />
[[Category: FAQ's]]<br />
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{{Stub}}<br />
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Qolyan
https://cfd-online.com/Wiki/Aerospace
Aerospace
2005-12-13T03:48:58Z
<p>Qolyan: </p>
<hr />
<div>CFD related to aerospace applications like aircrafts, rockets, sattelites, ... Note that aero-engine related things are covered in the [[Turbomachinery]] section.<br />
<br />
==External links==<br />
<br />
[http://www.aiaa.org/tc/apa/dragpredworkshop/dpw.html AIAA CFD Drag Prediction Workshop]<br />
<br />
[http://aaac.larc.nasa.gov/tsab/cfdlarc/aiaa-dpw/ AIAA CFD Drag Prediction Workshop - 2006 edition]<br />
<br />
{{stub}}<br />
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Qolyan
https://cfd-online.com/Wiki/Turbomachinery
Turbomachinery
2005-12-13T03:48:48Z
<p>Qolyan: </p>
<hr />
<div>CFD related to turbomachinery applications like compressors, turbines, combustors, ... Note that other aerospace application are covered in the [[Aerospace]] section.<br />
<br />
==External links==<br />
<br />
===Engine companies===<br />
<br />
*[http://www.geae.com/ GE Aircraft Engines]<br />
*[http://www.pratt-whitney.com/ Pratt & Whitney]<br />
*[http://www.rolls-royce.com/index_flash.jsp Rolls-Royce]<br />
<br />
{{stub}}<br />
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Qolyan
https://cfd-online.com/Wiki/Best_practice_guidelines_for_automotive_CFD
Best practice guidelines for automotive CFD
2005-12-13T03:48:45Z
<p>Qolyan: </p>
<hr />
<div>{{stub}}<br />
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https://cfd-online.com/Wiki/Reference_section
Reference section
2005-12-13T03:48:21Z
<p>Qolyan: </p>
<hr />
<div>The goal is to provide comprehensive coverage of fluid dynamics, governing equations, turbulence modeling, numerics, discretization schemes, solvers, heat transfer...<br />
<br />
*[[Introduction to CFD]]<br />
*[[Fluid dynamics | Fluid Dynamics]]<br />
*[[Turbulence modeling | Turbulence Modeling]]<br />
*[[Numerical methods | Numerical Methods]]<br />
*[[Heat transfer | Heat Transfer]]<br />
*[[Meshing]]<br />
*[[Nomenclature | Nomenclature]]<br />
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https://cfd-online.com/Wiki/Aero-acoustics_and_noise
Aero-acoustics and noise
2005-12-13T03:48:21Z
<p>Qolyan: </p>
<hr />
<div>== Introduction ==<br />
Sound can be understood as the pressure fluctuation in a medium. Acoustics is the study of sound propagation in a medium; AeroAcoustics deals with the study of sound propagation in air. As a result of the stringent conditions imposed on the Aircraft industries to limit noise pollution, focus is now shifting towards predicting the noise generated by a given aerodynamic flow.<br />
<br />
AeroAcoustics is an advanced field of fluid dynamics in which the flow scale is removed to the acoustic levels. The first advance in the field of AeroAcoustics was made by Sir James Lighthill when he presented an &quot;Acoustic Analogy&quot;. With proper manipulation of the Euler equations, he derived a wave equation based on pressure as the fluctuating variable, and the flow variables contributing to the source of fluctuation. The resulting wave equation can then be integrated with the help of Green's Function, or can be integrated numerically. Thus, this equation can represent the sound propagation from a source in an ambient condition. With the success of the acoustic analogy, many improvements were made on the derivation of the wave equation. Two common form of the equation used in the acoustic analogy are the Ffowcs Williams - Hawkins equation and the Kirchoff's Equation. <br />
<br />
Although the Acoustic Analogy solves the problem of noise prediction to a great extent, focus is now shifting towards direct computation, in which noise is computed directly by the flow solver. Of course the acoustic analogy is still applied in far field propagation, but near field sound generation is resolved to a large extent. Large Eddy Simulation is widely used for these studies. DNS is still unuseable for problems of practical dimensions; industries require a code that can provide them results in a day, not a month. Hence, RANS based models (like JET3D by NASA) are widely used in industry.<br />
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One of the main difficulties in Computational AeroAcoustics is the scale of the problem. Acoustic waves have a high velocity relative to the flow structures and, at the same time, are nearly 10 orders of magnitude smaller. Also, due to the propagation to long distances, the numerical scheme should be less dissipative and less dispersive. The CFD solvers have inherent dissipation to ensure stability. This makes most robust CFD solvers incapable of simulating acoustic flows. Advanced schemes such as Dispersion Relation Preserving (DRP) schemes, compact schemes etc., aim at a less dispersive solution. Still, given the limits of current computational capability, acoustic computation for a problem of practical interest is still out of reach.<br />
<br />
== Different Methods ==<br />
=== DNS === <br />
=== Green's Function ===<br />
=== incompressible/acoustic splitting === <br />
==Higher Order Schemes for Aero-acoustics==<br />
=== Finite Difference ===<br />
=== Finite Volume ===<br />
==Boundary Conditions ==<br />
== Reference ==<br />
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