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...UFR 2-05 Description|references=UFR 2-05 References|testcase=UFR 2-05 Test Case|evaluation=UFR 2-05 Evaluation|qualityreview=UFR 2-05 Quality Review|bestpr = Test Case =

...UFR 3-13 Description|references=UFR 3-13 References|testcase=UFR 3-13 Test Case|evaluation=UFR 3-13 Evaluation|qualityreview=UFR 3-13 Quality Review|bestpr = Test Case =

...UFR 3-08 Description|references=UFR 3-08 References|testcase=UFR 3-08 Test Case|evaluation=UFR 3-08 Evaluation|qualityreview=UFR 3-08 Quality Review|bestpr ...eroid. ''AGARD FDP WG-14 Experimental test cases for C FD validation, Test Case ID: GE-20''

...UFR 4-11 Description|references=UFR 4-11 References|testcase=UFR 4-11 Test Case|evaluation=UFR 4-11 Evaluation|qualityreview=UFR 4-11 Quality Review|bestpr In comparing the CFD calculations with experiment, Run 03 is used as a 'base case' against which the effects of the various modelling refinements are judged:

...UFR 2-01 Description|references=UFR 2-01 References|testcase=UFR 2-01 Test Case|evaluation=UFR 2-01 Evaluation|qualityreview=UFR 2-01 Quality Review|bestpr = Test Case =

...math>. In the present investigation a block-structured grid for the subset case is used. The entire grid consists of about 14 million control volumes (CVs) ...f the walls has to be high. For deforming grids such as in the present FSI case, it is furthermore crucial to keep a high quality grid after strong grid mo

...UFR 3-14 Description|references=UFR 3-14 References|testcase=UFR 3-14 Test Case|evaluation=UFR 3-14 Evaluation|qualityreview=UFR 3-14 Quality Review|bestpr ...umber dependence are less significant than they are for the more classical case of, for example, flow over a circular cylinder. On the other hand, in this

...UFR 2-03 Description|references=UFR 2-03 References|testcase=UFR 2-03 Test Case|evaluation=UFR 2-03 Evaluation|qualityreview=UFR 2-03 Quality Review|bestpr ...to show the representative efforts and status of CFD predictions for this case. In historical order these are: [11], [12] and [8] (pdf version available f

...UFR 4-03 Description|references=UFR 4-03 References|testcase=UFR 4-03 Test Case|evaluation=UFR 4-03 Evaluation|qualityreview=UFR 4-03 Quality Review|bestpr = Test Case =

...UFR 3-01 Description|references=UFR 3-01 References|testcase=UFR 3-01 Test Case|evaluation=UFR 3-01 Evaluation|qualityreview=UFR 3-01 Quality Review|bestpr = Test Case =

...y EDF) have been carried out for a range of the test data. These include a study of the influence of the bulk velocity in the auxiliary pipe as indicated in The grid dependence study has been carried out with meshes of 100000, 400000, and 1500000 nodes for e

...nini, C., Marra, A.M., Procino, L., Ricciardelli, F.''', 2011. Wind tunnel study on the aerodynamics of a 5:1 rectangular cylinder in smooth flow, In: Proce ...Bosco, A.''', 2010. 3D flow around a rectangular cylinder: a computational study. Journal of Wind Engineering and Industrial Aerodynamics 98, 263 &ndas

...UFR 3-10 Description|references=UFR 3-10 References|testcase=UFR 3-10 Test Case|evaluation=UFR 3-10 Evaluation|qualityreview=UFR 3-10 Quality Review|bestpr '''Eriksson, J., Karlsson, R.I. & Persson, J.''' (1998) An Experimental Study of a Two-Dimensional Plane Turbulent Wall Jet. Exp Fluids 25: 50-60

A series of numerical simulations was undertaken to study a highly swirling turbulent Nine turbulence models are compared: four high-Reynolds number models URANS,

...nditions at Reynolds number 4.1 x 106 have been chosen for a more detailed study : • '''CASE 1'''

experimental data for four measurements stations after the shock-wave (h₁, h₂, h diffuser throat height,resulting in the following four stations:

= Test Case Study = == Brief Description of the Study Test Case ==

results obtained for the two configurations (full and subset case) are compared. Based on this evaluation one case is chosen for a parameter study presented in the second section.

...UFR 3-10 Description|references=UFR 3-10 References|testcase=UFR 3-10 Test Case|evaluation=UFR 3-10 Evaluation|qualityreview=UFR 3-10 Quality Review|bestpr ...sulting data set is included in the ERCOFTAC data base and has been a test case at two ERCOFTAC/IAHR Workshops on Refined Turbulence Modelling (Paris 1996,

= Description of Study Test Case = ...H</i> = 1 was chosen as the reference height for both urban models. In the case of the lateral openings, all quantitates were measured at the right (labell

= Test Case Study = == Brief Description of the Study Test Case ==

...he effects that the relative end-wall/blade motion introduces to the flow. Four experimental cases arise from the combination of 2 tip-clearance heights an '''Case 1'''. The tip-clearance size is t/C=2% and the hub rotates at N=6540 rpm.

= Test Case Study = == Brief Description of the Study Test Case ==

...rom an integration on all grid cells from hub to shroud. For the LSCC test case at design point, Rautaheimo et al. (2001) have identified that when using t • To make a sensitivity study of the [[DOAPs]] to the number of grid points used in the streamwise direct

= Test Case Study = ...Young’s modulus of the rubber was determined based on a purely static test case to

...UFR 2-07 Description|references=UFR 2-07 References|testcase=UFR 2-07 Test Case|evaluation=UFR 2-07 Evaluation|qualityreview=UFR 2-07 Quality Review|bestpr = Test Case =

...have been reported by Guy et al (1999). One of the main objectives of this study was to establish whether buoyancy might cause the flow to become unstable, ...evidence, it was argued that this might indicate flow instability in this case.

...UFR 3-04 Description|references=UFR 3-04 References|testcase=UFR 3-04 Test Case|evaluation=UFR 3-04 Evaluation|qualityreview=UFR 3-04 Quality Review|bestpr = Test Case =

...UFR 2-06 Description|references=UFR 2-06 References|testcase=UFR 2-06 Test Case|evaluation=UFR 2-06 Evaluation|qualityreview=UFR 2-06 Quality Review|bestpr = Test Case =

...UFR 3-03 Description|references=UFR 3-03 References|testcase=UFR 3-03 Test Case|evaluation=UFR 3-03 Evaluation|qualityreview=UFR 3-03 Quality Review|bestpr ...dients. This effect has to be captured accurately by a turbulence model in case of a solution based on the Reynolds averaged Navier-Stokes (RANS) equations

...influence on the wake: outlet at x=5L is generally used, but no systematic study have been performed. ...ery complex and precise specifications cannot be given. A grid sensitivity study is strongly advised, since the predictions are very sensitive to the mesh r

case (NACA0021 airfoil at 60° angle of attack, experiments of Swalwell&nbsp;'' *Thorough documentation of a test case suitable for the verification of either new developments or new imple

...ructure deformation and the turbulent flow field found in the present test case, experimentally and numerically obtained unsteady results are presented in Figure 11 is composed of four images of the instantaneous flow field (streamwise velocity component) expe

= Test Case Study = == Brief Description of the Study Test Case ==

...UFR 4-03 Description|references=UFR 4-03 References|testcase=UFR 4-03 Test Case|evaluation=UFR 4-03 Evaluation|qualityreview=UFR 4-03 Quality Review|bestpr Zeman O. (1995) The persistence of trailing vortices - a modelling study. ''Physics of Fluids'' '''7''', 135-143.

...additionally effects would overlap or compensate during such a parametric study. ...lt the combustion takes place too early. As shown above, in the isothermal case of this configuration, the k-epsilon model is generally able to predict the

...e test report [1]. For the four test conditions chosen for a more detailed study, skin friction and mean flow profile data in the boundary layers and wakes A number of runs have been made to study the surface flow by using a very thin layer of oil of high viscosity. Photo

...UFR 1-01 Description|references=UFR 1-01 References|testcase=UFR 1-01 Test Case|evaluation=UFR 1-01 Evaluation|qualityreview=UFR 1-01 Quality Review|bestpr ...taken from Cumber et al. (1994), shows the radial values of Mach number at four different downstream locations, as computed with the two models, alongside

= Test Case Study = == Brief Description of the Study Test Case ==

...UFR 3-15 Description|references=UFR 3-15 References|testcase=UFR 3-15 Test Case|evaluation=UFR 3-15 Evaluation|qualityreview=UFR 3-15 Quality Review|bestpr ''1: A refinement study is referenced showing that the resolution is appropriate.''

...ff-body burner, like the piloted burner, provides a flame suitable for the study of turbulence-chemistry interactions. Bluff-body burners also bear a great The bluff-body burner, provides a flame suitable for the study of turbulence-chemistry interactions. The bluff-body burner also bears a gr

= Test Case Studies = == Brief description of the study test case ==

= Test Case Study = == Brief Description of the Study Test Case ==

Table EXP-A Summary description of Test Case 615B =='''Test case 615B'''==

Experimental data from the annular compressor cascade is available for four experiments. These correspond to tip-clearance sizes of 2% and 4% chord and !'''''CASE'''''!! '''''GNDP'''''!! colspan="3"| '''''PDPs''''' !! colspan="2"| '''''MP

...UFR 3-11 Description|references=UFR 3-11 References|testcase=UFR 3-11 Test Case|evaluation=UFR 3-11 Evaluation|qualityreview=UFR 3-11 Quality Review|bestpr Devenport, W.J. and Sutton, E.P. (1993) &lsquo;An Experimental Study of Two Flows Through an Axisymmetric Sudden Expansion&rsquo;, ''Experiments

The case UFR 3-33 concerns a smooth rigid hemisphere mounted on a smooth plate expos ...in the vicinity of the walls has to be high. The grid used in the present case shows in the whole computational domain a high level of the ''skew quality

(shown in Fig.1) is a widely used test case for that the Sandia D Flame is not a demanding test case it seems to be

...UFR 2-05 Description|references=UFR 2-05 References|testcase=UFR 2-05 Test Case|evaluation=UFR 2-05 Evaluation|qualityreview=UFR 2-05 Quality Review|bestpr ...standard eddy-viscosity models failed to predict separation in the F2 test case conditions. Even when the pressure distribution is more or less satisfactor

...UFR 4-13 Description|references=UFR 4-13 References|testcase=UFR 4-13 Test Case|evaluation=UFR 4-13 Evaluation|qualityreview=UFR 4-13 Quality Review|bestpr ...the Single Cycle method, only part of a cycle is computed, this allows to study each phenomenon separately. The specification of the initial conditions is

...t (T) on the propeller curve (single runner blade angle curve). The second case is off-cam i.e. the right-leg (R) on the propeller curve. Both are conducte ...after (n), e.g. T(r) in the text (or Tr in file names) refers to the early Case T measurements. A more thorough discussion, that describes the different op

...channel as proposed by Mellen et al. (2000) is a geometrically simple test case, ...the flow over periodically arranged hills is a very useful benchmark test case since it represents well-defined boundary conditions, can be computed at af

...UFR 3-07 Description|references=UFR 3-07 References|testcase=UFR 3-07 Test Case|evaluation=UFR 3-07 Evaluation|qualityreview=UFR 3-07 Quality Review|bestpr ...Nuclear Reactors'', Vol. 2, (eds. Kakac, S. and Spalding, D.B.), Advanced Study Institute Book, pp. 613-640.

= Test Case = ==Brief Description of the Study Test Case==

* Breuer (2000), Breuer, M.: A challenging test case for large-eddy simulation: high Reynolds number circular cylinder flow, Int * Breuer (2005), Breuer, M.: New reference data for the hill flow test case, <!--http://www.hy.bv.tum.de/DFG-CNRS/-->''no longer online''

...e comparison with URANS. For the URANS cases, an extended grid convergence study was performed using seven URANS grids to analyze the influence of the spati ...n. The inlet and outlet of the cannulas were placed sufficiently far away (four and seven impeller diameters respectively; not shown here) from the pump in

velocity in this case was overpredicted by nearly a factor of two. this case, the peak velocity is overpredicted by 27 %, 61 % and 67 %

...UFR 4-09 Description|references=UFR 4-09 References|testcase=UFR 4-09 Test Case|evaluation=UFR 4-09 Evaluation|qualityreview=UFR 4-09 Quality Review|bestpr = Test Case =

...UFR 4-14 Description|references=UFR 4-14 References|testcase=UFR 4-14 Test Case|evaluation=UFR 4-14 Evaluation|qualityreview=UFR 4-14 Quality Review|bestpr Bullen, P.R., Cheeseman, D.J., Hussain, L.A. (1996) &ldquo;A study of turbulent flow in pipe contractions&rdquo;, ''Proc. of'' ''IMechE Part E

if high-speed flows are considered, in which case the unsteadiness is in shock reflections, while the first one fails for this flow case. A

...and has long been of interest to scientists and engineers. The goal of the study on which this AC is based has been to replicate experiments carried out in Due to the simple geometry, this test case is quite attractive for verifying and validating new algorithms and models

* Cantwell, B., Coles, D., 1983. An experimental study of entrainment and transport in the turbulent near wake of a circular cylin ...e: a complementary experimental-numerical investigation and a new FSI test case (FSI-PfS-1a). Int. Journal of Computers and Fluids 99, 18&ndash;43.

...he US Environmental Protection Agency laboratories. An example of the hill case is shown in figure 1; three hills and a corresponding set of three valleys ...was located at x=-a, 0 or a (where a is the hill half-length) and, in each case, at various heights. This allowed determination of ‘terrain amplification

...UFR 1-01 Description|references=UFR 1-01 References|testcase=UFR 1-01 Test Case|evaluation=UFR 1-01 Evaluation|qualityreview=UFR 1-01 Quality Review|bestpr = Test Case =

A series of numerical simulations was undertaken to study both inert and reactive flow over a the triangular bluff-body in order to r In the present study the RANS/URANS, SAS and LES approaches were used. It is worth noting that

...UFR 1-01 Description|references=UFR 1-01 References|testcase=UFR 1-01 Test Case|evaluation=UFR 1-01 Evaluation|qualityreview=UFR 1-01 Quality Review|bestpr Crist S., Sherman P.M., Glass D.R., 1966, &ldquo;Study of the Highly Underexpanded Sonic Jet&rdquo;, ''AIAA Journal'', '''4''', pp

The empirical study of the structure of the measured flow identifies several zones, depending o ...stion chamber. Stretching is applied towards the boundary of the outlet. A study of the grid sensibility is done and discussed in paragraph 4.2. The details

This test case considers the flow around a wing mounted on a flat plate, which is represen = Review of previous studies and choice of test case=

...4''c'' in the spanwise direction for the NACA0021 at 60° angle of attack case. ...ller for lower angles of attack (e.g. around 2 chords seen for NACA0012 case at 45°) and is expected to be larger for larger angles up to 90°.

...ption=UFR_2-02_Descr|references=UFR 2-02 References|testcase=UFR 2-02 Test Case|evaluation=UFR 2-02 Evaluation|qualityreview=UFR 2-02 Quality Review|bestpr ...together with the two-layer approach, k is overpredicted. This is also the case with the RSM model, but the peak is now at the correct location. It appears

...UFR 4-13 Description|references=UFR 4-13 References|testcase=UFR 4-13 Test Case|evaluation=UFR 4-13 Evaluation|qualityreview=UFR 4-13 Quality Review|bestpr = Test Case =

...circuit, the measurement systems and the test section used in the present study. The flow circuit consisted of a tank from which two separate streams of wa For each test case, velocity was measured using the LDA probe at a particular elevation in the

...UFR 3-09 Description|references=UFR 3-09 References|testcase=UFR 3-09 Test Case|evaluation=UFR 3-09 Evaluation|qualityreview=UFR 3-09 Quality Review|bestpr = Test Case =

...UFR 4-13 Description|references=UFR 4-13 References|testcase=UFR 4-13 Test Case|evaluation=UFR 4-13 Evaluation|qualityreview=UFR 4-13 Quality Review|bestpr ...., Hu,Z., Whitelaw,J.H., Steady flow characterization of tumble-generating four-valve cylinder heads . Proceedings of the Institution of Mechanical Enginee

...UFR 3-10 Description|references=UFR 3-10 References|testcase=UFR 3-10 Test Case|evaluation=UFR 3-10 Evaluation|qualityreview=UFR 3-10 Quality Review|bestpr = Test Case =

= Test Case Study = == Brief Description of the Study Test Case ==

...ting, ventilation and cooling systems that can be applied. In the specific case described here the system injects cooler air through diffusers mounted in t ...g. This approach leads to temperature stratification within the space. The case chosen for this application challenge is challenging because it is a combin

...e: a complementary experimental-numerical investigation and a new FSI test case (FSI-PfS-1a). Int. Journal of Computers and Fluids 99, 18–43.

...able, also provide the spectral analysis curves (von Neumann analysis). In case LES is ...estimation of the grid resolution. Finally, provide the grids used for the study. -->

...Topp C, 2000. Low Reynolds number effects in ventilated rooms: a numerical study. Proc. of Roomvent 2000, Oxford: 307-312.</div> *<div id="32">Nielsen PV, 1990. Specification of a two-dimensional test case. International Energy Agency, Energy Conservation in Buildings and Communit

...UFR 3-04 Description|references=UFR 3-04 References|testcase=UFR 3-04 Test Case|evaluation=UFR 3-04 Evaluation|qualityreview=UFR 3-04 Quality Review|bestpr ...the Tollmien-Schlichting waves. This is a common mode of transition in the case of turbomachinery flows.

...experiment as well as those obtained in the main computations (go to "Test Case Studies" section to find the definition of the Nusselt number and its avera ...ections but in the stream-wise and span-wise ones (the mesh in the present study contains 76 million cells and their mesh contained 5.5 million cells),

...is simple, the strong buoyancy effects result in complex flow physics. The case thus provides a stringent test of the turbulence models’ performance in p This is a test case by which the competency of CFD for use in nuclear power stations can be jud

* For simulation of the selected UFR test case, open boundaries should be used on all sides of the flow domain except for * For simulation of the selected UFR test case, the domain should extend at least 4 metres radially and vertically to mini

...g vibrations of the hydraulic turbine structure that can lead to damage in case of resonance. Pressure pulsations, generated by a precessing vortex rope, m ...arhat, M., Avellan, F., Miyagawa, K., & Tsujimoto, Y. (2010). Experimental study and numerical simulation of cavity oscillation in a diffuser with swirling

...UFR 4-05 Description|references=UFR 4-05 References|testcase=UFR 4-05 Test Case|evaluation=UFR 4-05 Evaluation|qualityreview=UFR 4-05 Quality Review|bestpr AGARD study

...UFR 4-10 Description|references=UFR 4-10 References|testcase=UFR 4-10 Test Case|evaluation=UFR 4-10 Evaluation|qualityreview=UFR 4-10 Quality Review|bestpr 13. A.A.Dafa&rsquo;Alla and P.L.Betts. Experimental study of turbulent natural convection in a tall air cavity, ''Experimental Heat T

The experimental and numerical setups applied in this study were described in detail by Schanderl et al. (2017b) (PIV and LES). The exp = Test Case Experiments =

In particular, an in-progress overview after the first four years of activity is provided in [&#8204;[[UFR_2-15_References#12|12]]]. == Review of UFR studies and choice of test case ==

...fluid engineering quite often involve complex turbulent flows. This is the case for example in turbine engines, industrial furnaces, combustors and burners ...he combustion process, so that the first step to understand a burner is to study the flow field in cold conditions. It is essential to understand the behavi

=='''Simulation Case CFD1'''== =='''Simulation Case CFD2'''==

==Description of Test Case Experiments== For the detailed study of particle-laden, swirling two-phase flows, a

=='''Simulation Case CFD2'''== ...nnel boundary layer conditions were inappropriate for the purposes of this study.

= Test Case = == Brief Description of the Study Test Case==

...effective blade surface and the increased leakage losses. For the present case an increase of the tip clearance width by 50% led to a reduction in total p ...uld cover the region well up- and downstream of the stage. For the current case, the domain was chosen to start at 60% of the inlet shroud diameter before

= Test Case Study = == Brief Description of the Test Case ==

...for the head <math> H </math> is estimated to be ≈ 3 mmHg for the present case. ...flow cannulas are included. These cannulas should extend sufficiently far (four and seven times the impeller diameter, respectively) from the guide vanes.

= Test Case Study = == Brief Description of the Study Test Case ==

...interesting features are common in all calculations performed using these four computational methods. All of them resulted in near grid independent soluti ...rotating hub has been computed twice in order to perform a grid dependency study. In [[#Table CFD-B|Table CFD-B]], the available data files that correspond

<ref name="ftn2">The local Froude number in this case is evaluated on the plume centreline. ...le the plume may hit a wall or encounter regions of flow recirculation. To study these more complex flows, a more general-purpose CFD approach must be used.