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• Flow around a circular cylinder
  ... in the details (both geometry and boundary conditions) that can be used. A typical geometry is shown below (not to scale). ...ulent flow. The DNS, LES, and the transitional cases are still considered a research cases. Many different numerical techniques have been used to solv
  6 KB (884 words) - 11:31, 8 April 2017

Page text matches

• Main Page
  ...CFD-Wiki by using the [http://www.cfd-online.com/Tellafriend/wiki.php tell a friend] tool or [http://www.cfd-online.com/Marketing/wiki.php#linking linki The Baldwin-Lomax model is a classical algebraic turbulence model which is suitable for high-speed flows
  6 KB (823 words) - 21:52, 9 December 2017
• Codes
  ....eng.unimelb.edu.au/daltonh/downloads/arb/ arb homepage]||GMSH (.msh) || N/A | align="left" |[[CaNS]] -- [https://github.com/p-costa/CaNS CaNS homepage] a code for very fast massively-parallel DNS of canonical flows || || July 20
  25 KB (3,558 words) - 08:31, 23 January 2024
• Fluid dynamics
  ... and are called the [[Navier-Stokes equations]] which govern the motion of a viscous, heat conducting fluid. Various simplifications of these equations ...ourses/me111/pdf/poem-Naomi.pdf The Turbulent History of Fluid Mechanics], a poem by Naomi Tsafnat
  2 KB (205 words) - 10:17, 13 March 2013
• Source code archive
  ...n a zip or tar.gz file and [[Special:Upload|uploaded]] and linked to using a <nowiki>[[Media:filename.tar.gz]]</nowiki> link. ...(this is the default if you don't specify anything else) or released under a GPL copyleft license. See [[CFD-Wiki:Copyrights]] for more information.
  1 KB (203 words) - 17:39, 14 June 2012
• Reynolds number
  ...er characterises the relative importance of inertial and viscous forces in a flow. It is important in determining the state of the [[flow]], whether it ==Reynolds number as a ratio of time scales==
  3 KB (450 words) - 09:15, 3 January 2012
• Navier-Stokes equations
  ...id. It is a vector equation obtained by applying Newton's Law of Motion to a fluid element and is also called the ''momentum equation''. It is supplemen ...continuity equation (1), momentum equation (2) and energy equation (3) for a compressible fluid can be written as:
  29 KB (4,606 words) - 18:17, 28 August 2012
• Posdat.f
  POSDAT always receives a wealth of information about all the cells and these may be useful in creati It is a li'l difficult to understand what these mean. See the following pic:
  3 KB (540 words) - 12:13, 3 September 2011
• Introduction to turbulence
  ...l analysis/Estimation from a finite number of realizations|Estimation from a finite number of realizations]] ** [[Introduction to turbulence/Statistical analysis/Estimation from a finite number of realizations#Estimators for averaged quantities|Estimators
  8 KB (948 words) - 12:34, 15 March 2012
• Reynolds stress model (RSM)
  ...assical turbulence model. The method of closure employed is usually called a ''Second Order Closure''. This modelling approach originates from the works these turbulent components return to isotropy. Such a correlation is
  8 KB (1,203 words) - 01:47, 18 April 2017
• Near-wall treatment for k-omega models
  where <math>y</math> is the cell centroid distance from the wall. Using this a blending can take the following form: ...at the wall-adjacent cell should be on the order of '''y+ = 1'''. However, a higher y+ is acceptable as long as it is well inside the viscous sublayer (
  4 KB (581 words) - 10:40, 31 March 2021
• Favre averaging
  ...h>\widetilde{\Phi}</math> and a fluctuating part <math>\Phi''</math> using a density weighted average in the following way:
  1 KB (209 words) - 21:48, 26 August 2013
• Direct numerical simulation (DNS)
  A '''direct numerical simulation (DNS)''' is a simulation in computational fluid dynamics in which the [[Navier-Stokes equ To satisfy these resolution requirements, the number ''N'' of points along a given mesh direction with increments ''h'', must be
  4 KB (672 words) - 13:52, 25 July 2012
• Fluent FAQ
  ...e company that is now part of ANSYS Inc. Fluent (the software package) is a popular commercial CFD package. Gambit is a meshing software package that is typically purchased{{Fact}} with Fluent.
  39 KB (6,386 words) - 16:48, 26 April 2013
• Best practice guidelines
  ...rs. By sharing our experience about how to best perform a CFD analysis for a particular problem we can help each other and learn from each others mistak '''''If you miss a guide feel free to start it by adding a link to it from this page.'''''
  1 KB (189 words) - 19:11, 20 January 2012
• Best practice guidelines for turbomachinery CFD
  .... The intended audience is expected to know basic CFD terminology and have a basic turbomachinery knowledge, but no detailed knowledge about CFD for tur ...and what physical phenomena that affect the results. This chapter contains a brief overview of the various types of simulations and some hints of what c
  41 KB (6,252 words) - 08:46, 4 March 2023
• Baldwin-Lomax model
  ...ic 0-equation model which gives the eddy viscosity, <math>\mu_t</math>, as a function of the local boundary layer velocity profile. The model is suitabl l = k y \left( 1 - e^{\frac{-y^+}{A^+}} \right)
  8 KB (1,262 words) - 09:15, 3 January 2012
• Turbulence modeling
  ...ns. Virtually all engineering applications are turbulent and hence require a turbulence model. #### [[A roughness-dependent model]]
  3 KB (282 words) - 19:16, 10 April 2021
• Two equation turbulence models
  ...t equations to represent the turbulent properties of the flow. This allows a two equation model to account for history effects like convection and diffu Where <math>\mu_t</math> is a scalar property called the [[Eddy viscosity|eddy viscosity]] which is norma
  11 KB (1,667 words) - 20:52, 25 October 2016
• Introduction to turbulence/Nature of turbulence
  ...artistic forms. Subconsciously we find ourselves observing exhaust jets on a frosty day; we are willingly hypnotized by licking flames in an open hearth SONNET TO TURBULENCE by S. Corrsin <ref>Stan Corrsin was a famous and much beloved turbulence researcher and professor at the Johns Ho
  16 KB (2,597 words) - 21:12, 9 November 2016
• Ansys FAQ
  ==== My steady state solution converges for a while but stops converging before reaching my convergence criteria ==== Failure to obtain full convergence is a common issue for steady state simulations. It often occurs when doing mesh
  27 KB (4,461 words) - 02:03, 18 August 2018
• Incompressible flow
  ...roperty of the flow and not of the fluid. The rate of change of density of a material fluid element is given by the material derivative ...orm in an incompressible flow. All that is required is that the density of a fluid element should not change in time as it moves through space. For exam
  8 KB (1,427 words) - 18:57, 19 August 2013
• Potential flow
  A flow in which vorticity is zero is called potential flow, or irrotational f it implies that the velocity is the gradient of a scalar field called the velocity potential, and usually denoted as <math>\p
  800 B (127 words) - 13:06, 16 March 2016
• Inviscid flow
  A flow in which viscous effects can be neglected is known as ''inviscid flow' Have a look at this discussion:<br>
  2 KB (323 words) - 07:46, 20 August 2013
• Siemens FAQ
  This section is empty. This is just a suggestion on how to structure it. Please feel free to add questions and an ... Everytime copy pasting the code or renaming the files as POSDAT.F may be a little boring / inefficient. In stead the following procedure can be adopt
  8 KB (1,278 words) - 21:48, 9 December 2017
• Validation and test cases
  ...for the validation and benchmarking of CFD codes. Articles should include a description of the case, data to compare with, and possibly contributed sol ...the testing then is to determine if the code works properly), or it can be a commercial code (the testing then is to determine if the code is suitable f
  4 KB (629 words) - 21:50, 3 August 2017
• Introduction to CFD
  ...nding the governing laws and the nature of fluids themselves, resulting in a complex yet theoretically strong field of research.</p> ...ved on in geometrical domain divided into small volumes, commonly known as a [[Meshing | mesh (or grid)]]. </p>
  2 KB (401 words) - 06:50, 8 January 2013
• Lid-driven cavity problem
  ...ndary conditions are also simple. The standard case is fluid contained in a square domain with Dirichlet boundary conditions on all sides, with three s ...n also be done with the lid replaced with a moving fluid. This problem is a somewhat different situation, and is usually referred to as the shear-drive
  3 KB (546 words) - 12:44, 9 April 2013
• Large eddy simulation (LES)
  ...dies in a calculation and implicitly account for the small eddies by using a [[#Subgrid-scale models|subgrid-scale model]] (SGS model). ...Formally, one may think of filtering as the convolution of a function with a [[LES filters|filtering kernel]] <math>G</math>:
  6 KB (882 words) - 21:50, 24 June 2013
• Spalart-Allmaras model
  ...lmaras model is a one equation model which solves a transport equation for a viscosity-like variable <math>\tilde{\nu}</math>. This may be referred to a [Dacles-Mariani et. al. 1995] proposed a modification of the model which also accounts for the effect of mean strain
  4 KB (662 words) - 13:34, 23 April 2015
• Finite volume
  ...cal fluid dynamics, the first step in the FVM is to divide the domain into a number of control volumes (aka cells, elements) where the variable of inter ...ole computational domain and '''for any number of control volumes'''. Even a coarse grid solution exhibits exact integral balances.<br>
  4 KB (643 words) - 09:15, 3 January 2012
• Biconjugate gradient stabilized method
  A = coefficient matrix <br> M = the preconditioning matrix constructed by matrix A <br>
  2 KB (281 words) - 17:01, 31 October 2016
• OpenFOAM
  ...d approach which makes it easy to extend. The package includes modules for a wide range of applications. ...ry Weller and others at Imperial College. For a few years FOAM was sold as a commercial code by the company Nabla Ltd. However, in 2004 FOAM was release
  2 KB (322 words) - 08:58, 26 February 2019
• Gauss-Seidel method
  The '''Gauss-Seidel method''' is a technique used to solve a linear system of equations. The method is named after the German mathematic We seek the solution to a set of linear equations: <br>
  8 KB (1,113 words) - 09:15, 3 January 2012
• Jacobi method
  ...ged in. The process is then iterated until it converges. This algorithm is a stripped-down version of the Jacobi transformation method of matrix diagona :<math> A \phi = b </math> <br>
  6 KB (825 words) - 09:15, 3 January 2012
• Multigrid methods
  ...he gradient of the error from node to node. If the error is distributed in a high frequency mode, the convergence rate is fast. However, after the first For many iterative methods, the number of iterations required to reach a converged solution is linearly proportional to number of nodes in one direc
  5 KB (746 words) - 09:49, 12 July 2019
• 2-D vortex in isentropic flow
  Perturbations are added to the [[free-stream]] in such a way that there is no As a result of [[isentropy]], the exact solution corresponds to a pure [[advection]]
  2 KB (242 words) - 04:00, 21 October 2014
• Overset grids
  ...ach. In a full Chimera grid system, a complex geometry is decomposed into a system of geometrically simple overlapping grids. Boundary information is ...mera-type calculation is not insignificant, and thus has been automated to a high degree. In very general terms, there are three steps to setting up an
  7 KB (1,042 words) - 14:13, 17 August 2021
• Realisable k-epsilon model
  ...erline{\Omega_{ij}} </math> is the mean rate-of-rotation tensor viewed in a rotating reference frame with the angular velocity <math> \omega_k </math>
  2 KB (380 words) - 19:57, 16 December 2014
• Application areas
  ...ection is not very well developed yet. Most application areas just contain a short introduction and some links. Please feel free to expand an applicatio
  631 B (82 words) - 16:10, 11 October 2013
• Approximation Schemes for convective term - structured grids - Summary of Discretizations Schemes and examples
  ...f anyone have literature connected with convective schemes, please drop us a line. Of course You are welkome to participate in Wiki'' ...all be very glad and grateful to hear any critical suggestion (please drop a few lines at Wiki Forum)''
  9 KB (1,327 words) - 05:56, 21 April 2012
• Approximation Schemes for convective term - structured grids - Common
  Equation (1) is integrated over a control volume and the following discretized equation for <math>\boldsymbol ... can be explicitly formulated in terms of its neighbouring nodal values by a functional relationship of the form:
  28 KB (4,096 words) - 13:11, 24 October 2016
• Coeff 11.f90 - calculate the coefficients
  !MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the !You should have received a copy of the GNU General Public License
  5 KB (957 words) - 17:58, 20 April 2012
• Main.f90 - Main modul
  !MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the !You should have received a copy of the GNU General Public License
  2 KB (260 words) - 17:54, 20 April 2012
• Sample code for solving Smith-Hutton test - Fortran 90
  ''It's just a scrap. Later I'll correct it, although it's a complete working code'' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  3 KB (378 words) - 18:02, 20 April 2012
• HLPA.f90 - HLPA scheme implementation modul
  !MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the !You should have received a copy of the GNU General Public License
  2 KB (244 words) - 17:42, 15 June 2011
• LES filters
  ...s of LES, filtering a function is defined as convoluting the function with a filtering kernel, just as is typically done in electrical engineering. ...grid filter" whereby the filter cuts off the values of the function beyond a half filter width away.
  2 KB (283 words) - 09:15, 3 January 2012
• LU decomposition
  ...>L</math> and an upper triangular part <math>U</math> that will lead us to a direct procedure for the solution of the original system. This decompositi :<math>A = LU.</math>
  4 KB (696 words) - 09:22, 21 November 2011
• Tridiagonal matrix algorithm - TDMA (Thomas algorithm)
  ...imination that can be used to solve ''tridiagonal'' systems of equations. A tridiagonal system may be written as ...perations instead of <math>O(n^3)</math> required by Gaussian Elimination. A first sweep eliminates the <math>a_i</math>'s, and then an (abbreviated) ba
  4 KB (658 words) - 22:58, 14 September 2016
• Stokes flow
  ...flow of a highly viscous fluid. Since a high viscosity coefficient implies a low [[Reynolds number]], Stokes flow is also refered to as ''low Reynolds n
  494 B (72 words) - 08:30, 20 August 2013
• Meshing
  ...were 2D in nature. For 2D analyses, a domain split into elements resembles a wire mesh, hence the name. An example of a 2D analysis domain (flow over a backward facing step) and its mesh are shown in pictures below.
  2 KB (313 words) - 09:15, 3 January 2012