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• FAQ's
  :FAQ's about CFD-Wiki. [[Category: FAQ's]]
  1 KB (215 words) - 17:50, 12 December 2017
• Stratford's separation criterion
  ...sess if a turbulent boundary layer is likely to separate or not. Stratford's criteria says that from the start of the pressure recovery where the max ve ... used <math>k = 0.5</math>, which is a bit less conservative than Statford's original values.
  3 KB (543 words) - 11:10, 11 December 2013

Page text matches

• Main Page
  ===[[FAQ's]]===
  6 KB (823 words) - 21:52, 9 December 2017
• Codes
  ! Solver !! Mesh type(s) supported !! Last known version or year ! Generator !! Mesh type(s) supported !! Input filetypes supported
  25 KB (3,558 words) - 08:31, 23 January 2024
• Source code archive
  *[http://www.solvengineer.com/index.html '''SolveEngineer''' - Mihai Pruna's Website]
  1 KB (203 words) - 17:39, 14 June 2012
• Navier-Stokes equations
  ...heat conducting fluid. It is a vector equation obtained by applying Newton's Law of Motion to a fluid element and is also called the ''momentum equation The heat-flux, <math>q_j</math>, is given by Fourier's law:
  29 KB (4,606 words) - 18:17, 28 August 2012
• FAQ's
  :FAQ's about CFD-Wiki. [[Category: FAQ's]]
  1 KB (215 words) - 17:50, 12 December 2017
• Posdat.f
  | S | ...ing the commoned variable CX. If the z-coordinate is greater than the cell's coordinate, it is a "positive" z-beighbour else it could be negative. (ofco
  3 KB (540 words) - 12:13, 3 September 2011
• Reynolds stress model (RSM)
  consideration, a number of turbulent models, such as Rotta's model and Lumley's return-to-isotropy model, have been established.
  8 KB (1,203 words) - 01:47, 18 April 2017
• Near-wall treatment for k-omega models
  ''(For [...] wall functions, each wall-adjacent cell's centroid should be located within the log-law layer, 30 < y+ < 300. A y+ v
  4 KB (581 words) - 10:40, 31 March 2021
• Fluent FAQ
  === Using CFD-Online's Fluent Forum === * Scroll down to "I don't want a collector's account right now. Just give me the download-link." and click it.
  39 KB (6,386 words) - 16:48, 26 April 2013
• Best practice guidelines for turbomachinery CFD
  ...htly better but still do not behave well. More modern variants like Menter's [[SST k-omega model]] also has problems, wheras the [[V2-f models|v2f model ...ons with strong acceleration or deceleration. In the last few years Menter's low-Re <math>SST k-\omega</math> model has gained increased popularity.
  41 KB (6,252 words) - 08:46, 4 March 2023
• Baldwin-Lomax model
  * {{reference-paper|author=Baldwin, B. S. and Lomax, H.|year=1978|title=Thin Layer Approximation and Algebraic Model * {{reference-paper|author=Granville, P. S.|year=1987|title=Baldwin-Lomax Factors for Turbulent Boundary Layers in Pre
  8 KB (1,262 words) - 09:15, 3 January 2012
• Turbulence modeling
  #### [[Prandtl's one-equation model]] ##### [[Wilcox's k-omega model]]
  3 KB (282 words) - 19:16, 10 April 2021
• Introduction to turbulence/Nature of turbulence
  SONNET TO TURBULENCE by S. Corrsin <ref>Stan Corrsin was a famous and much beloved turbulence researc ...visor. </ref> on the occasion of his 70th birthday, with apologies to Bill S. and Liz B.B.
  16 KB (2,597 words) - 21:12, 9 November 2016
• Ansys FAQ
  ...ulation which has converged at a condition close to the problem simulation's condition.</LI> ...tion process, I get the warning message "A wall has been placed at portion(s) of an OUTLET" ====
  27 KB (4,461 words) - 02:03, 18 August 2018
• Numerical methods
  # [[Solution of Poisson's equation]] ### [[Moore's kd-tree algorithm]]
  4 KB (399 words) - 12:42, 26 August 2012
• Incompressible flow
  \frac{\partial u_i}{\partial t} = \pi^S (-u_j \frac{\partial u_i}{\partial x_j} + \nu \Delta u_i) , which result from the Helmholtz decomposition. <math>\pi^S</math> and <math>\pi^I</math> are the solenoidal (divergence-free) and irro
  8 KB (1,427 words) - 18:57, 19 August 2013
• Siemens FAQ
  ...-CCM+ lite version available with more limited functionality and CD-adapco's own 3D CAD tool ( 3D-CAD ) has been integrated into the STAR-CCM+ client. [[Category: FAQ's]]
  8 KB (1,278 words) - 21:48, 9 December 2017
• Large eddy simulation (LES)
  ...technique for simulating turbulent flows. An implication of [[Kolmogorov]]'s (1941) theory of self similarity is that the large eddies of the flow are d *{{reference-paper|author=Kim, W and Menon, S.|year=1995|title=A new dynamic one-equation subgrid-scale model for large e
  6 KB (882 words) - 21:50, 24 June 2013
• Spalart-Allmaras model
  ...\frac{\partial \tilde{\nu}}{\partial x_j} & = & C_{b1} [1 - f_{t2}] \tilde{S} \tilde{\nu} + \frac{1}{\sigma} \{ \nabla \cdot [(\nu + \tilde{\nu}) \nabla \tilde{S} \equiv S + \frac{ \tilde{\nu} }{ \kappa^2 d^2 } f_{v2}, \quad f_{v2} = 1 - \frac{\ch
  4 KB (662 words) - 13:34, 23 April 2015
• Finite volume
  |V_r| \frac{du_r}{dt} + \sum_{s \in N(r)} \int_{V_r \cap V_s} f_i n_i ds = 0
  4 KB (643 words) - 09:15, 3 January 2012
• Standard k-epsilon model
  :<math> P_k = \mu_t S^2 </math> Where <math> S </math> is the modulus of the mean rate-of-strain tensor, defined as : <br>
  3 KB (401 words) - 20:15, 16 December 2014
• Biconjugate gradient stabilized method
  : Allocate temperary vectors p, phat, s, shat, t, v, rtilde <br> :: s = r - alpha * v <br>
  2 KB (281 words) - 17:01, 31 October 2016
• Overset grids
  ...halmesh is freely available. Unfortuately, the other two are subject to U.S. goverment export controls, and are thus not generally available (see [http
  7 KB (1,042 words) - 14:13, 17 August 2021
• Realisable k-epsilon model
  ...lon}}\right) \frac{\partial \epsilon}{\partial x_j} \right ] + \rho \, C_1 S \epsilon - \rho \, C_2 \frac{{\epsilon}^2} {k + \sqrt{\nu \epsilon}} + C_{1 ...a}{\eta + 5}\right] , \;\;\;\;\; \eta = S \frac{k}{\epsilon}, \;\;\;\;\; S =\sqrt{2 S_{ij} S_{ij}} </math> <br>
  2 KB (380 words) - 19:57, 16 December 2014
• Approximation Schemes for convective term - structured grids - Summary of Discretizations Schemes and examples
  Below it's cleary seen the numerical diffusion impact, comparing the contour fields ob ''It's just a scrap. Later I'll correct it, although it's a complete working code''
  9 KB (1,327 words) - 05:56, 21 April 2012
• Approximation Schemes for convective term - structured grids - Common
  J_{h} - J_{l} & + J_{n} - J_{s} & + J_{e}- J_{w} & + \\ + D_{h} - D_{l} & + D_{n} - D_{s} & + D_{e} - D_{s} & = S_{p}
  28 KB (4,096 words) - 13:11, 24 October 2016
• Wall-adapting local eddy-viscosity (WALE) model
  ...lta _s^2 \frac{(S_{ij}^{d} S_{ij}^{d})^{3/2}}{(\overline{S}_{ij} \overline{S}_{ij})^{5/2} + (S_{ij}^{d} S_{ij}^{d})^{5/4}} </math>
  880 B (137 words) - 08:31, 19 May 2018
• Coeff 11.f90 - calculate the coefficients
  !------------------ s face-------------------- !------------------ s face--------------------
  5 KB (957 words) - 17:58, 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''
  3 KB (378 words) - 18:02, 20 April 2012
• LU decomposition
  do s = 1, n-j i = j + s
  4 KB (696 words) - 09:22, 21 November 2011
• Tridiagonal matrix algorithm - TDMA (Thomas algorithm)
  ...red by Gaussian Elimination. A first sweep eliminates the <math>a_i</math>'s, and then an (abbreviated) backward substitution produces the solution. Ex #{{reference-book|author=Conte, S.D., and deBoor, C.|year=1972|title=Elementary Numerical Analysis|rest= McGr
  4 KB (658 words) - 22:58, 14 September 2016
• SIMPLE algorithm
  * {{reference-paper|author=Patankar, S. V. and Spalding, D.B.|year=1972|title=A calculation procedure for heat, ma * {{reference-paper|author=Patankar, S. V.|year=1980|title=Numerical Heat Transfer and Fluid Flow|rest=Taylor & Fr
  3 KB (442 words) - 10:42, 11 March 2016
• Approximation Schemes for convective term - structured grids - What we need: Please help
  {{reference-paper | author=B. P. Leonard and S. Mokhtari| year=1990 | title=Beyond first-order upwinding: the ULTRA-SHARP {{reference-paper | author=B. P. Leonard and S. Mokhtari. | year=1990 | title=ULTRA-SHARP nonoscillatory convection scheme
  5 KB (615 words) - 17:27, 7 November 2011
• Sand box Approximation Schemes
  == S.K. Godunov's theorem == ...]] important in the development of the theory of [[high resolution scheme]]s for the numerical solution of [[partial differential equations]].
  26 KB (3,687 words) - 20:19, 7 November 2011
• Aero-acoustics and noise
  ...ustic analogy are the Ffowcs Williams - Hawkins equation and the Kirchhoff's Equation. === Green's Function ===
  5 KB (709 words) - 15:59, 23 June 2013
• V2-f models
  ...x \left[ \min \left( \frac{k}{\varepsilon},\, \frac{0.6}{\sqrt{6} C_{\mu} |S|\zeta} \right), C_T \left( \frac{\nu}{\varepsilon} \right)^{1/2} \right]</ \frac{k^{1/2}}{\sqrt{6} C_{\mu} |S| \zeta} \right), C_{\eta}
  6 KB (917 words) - 05:45, 7 February 2014
• Johnson-King model
  ...for popular turbulence models transport equations are solved which are PDE's). This model solves for a transport equation for the maximum shear stress. *<b>Johnson, D.A. and King, L.S.</b> A mathematically simple turbulence closure model for attached and sepa
  735 B (103 words) - 05:48, 17 January 2012
• Ahmed body
  The Ahmed body was described originally by S. R. Ahmed in 1984 [1]. Three main features were seen in the wake: ...s-section of 1.87x1.4 m2 (width x height) with a bulk [[velocity]] of 40 m/s. The [[test-section]] of the [[wind-tunnel]] was 3/4 open (only ground plat
  4 KB (577 words) - 05:46, 6 October 2015
• General CFD FAQ
  [[Category: FAQ's]]
  7 KB (1,199 words) - 13:47, 5 June 2013
• CHAM FAQ
  ...quation solver for each finite-volume equation is a modified form of Stone's strongly implicit solver, but the option exists to use a Conjugate Gradient * FROMM: FROMM's scheme
  37 KB (5,717 words) - 12:46, 9 December 2019
• Finite element
  where the a's are unknown coefficients that are to be determined. For an initial value, i ...functions, one can generate as many equations as there are unknowns (the a's) thus yielding a albegraic system of equations.
  1 KB (226 words) - 12:09, 31 August 2011
• Hall of fame
  *W.C.S. Wigley *S. Osher
  2 KB (324 words) - 18:33, 27 June 2018
• CFD quotations
  * It's deja-screw all over again <br> --''Gary Montry'' * The world's an exciting place when you know CFD <br>--''John Shadid''
  1 KB (255 words) - 13:45, 28 June 2018
• Gridgen
  Gridgen's end-of-life went into effect in September 2016. #Coon's patch
  2 KB (258 words) - 13:19, 13 June 2018
• Turbulence intensity
  {{reference-paper|author=[1] ANSYS, Inc.|year=2022|title=ANSYS Fluent User's Guide, Release R1|rest=Equation (7.71)}}
  5 KB (661 words) - 16:24, 23 July 2022
• Wall shear stress
  ...is pascal (<math>Pa</math>), which is identical to <math>\frac{kg}{m\cdot s^2}</math>.
  433 B (78 words) - 10:21, 5 December 2012
• Skin friction coefficient
  ...that the flow is laminar for the first part of the plate and using Blasius's equeation, after providing corrective some corrective factors , Schlichting
  4 KB (516 words) - 12:14, 14 January 2016
• Law of the wall
  |<math>\kappa</math> || von Karman's constant (<math>\approx 0.41</math>)
  744 B (111 words) - 08:32, 7 September 2011
• Introduction to turbulence/Statistical analysis/Ensemble average
  ...l result, you probably noticed that the value of the <math> X_{10} </math>'s was also a random variable and differed from ensemble to ensemble. Also the
  8 KB (1,391 words) - 12:29, 2 July 2011
• Introduction to turbulence/Reynolds averaged equations
  ...in reality three separate equations. These three equations are just Newton's second law written for a continuum in a spatial(or Eulerian) reference fram :<math>\tilde{T}_{ij}^{(v)}= 2\mu[\tilde{s}_{ij}-\frac{1}{3}\tilde{s}_{kk}\delta_{ij}] </math>
  45 KB (7,578 words) - 08:35, 21 August 2013