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1 
Predictive Capabilities of Advanced Turbulence Models in the Wake Region of a Wall Mounted CubeTaylor, Benjamin Hugh 09 December 2016 (has links)
This thesis seeks to investigate the predictive capabilities of Advanced turbulence models in the wake region of a wallmounted cube. Dynamic Hybrid RANS/LES (DHRL), Hybrid RANS/LES (HRL) models, Nonlinear Explicit Algebraic Reynolds Stress Model (NEARSM), One and Twoequation models, and numerical flux schemes will be compared against Direct Numerical Simulation (DNS) results to determine which model, or combination of models, produce the closest replication. The simulations were ran in LociChem using both builtin features and modular code additions. The simulation results show the Shear Stress Transport (SST) model ran with NEARSM and Optimized Gradient REconstruction (OGRE) scheme gives better results than all other RANS and HRL models investigated herein. This result is matched only by SST with DHRL and OGRE. The best results were achieved using SST with NEARSM, DHRL, and OGRE. Thus, the NEARSM model shows potential to improve simulation results compared to simpler linear eddyviscosity models.

2 
A Simple TwoEquation Turbulence Model For TransitionSensitive Cfd Simulations Of Missile NoseCone GeometriesJones, Joseph Matthew 15 December 2007 (has links)
This study reports the development and validation of a modified twoequation eddyviscosity turbulence model for computational fluid dynamics prediction of transitional and turbulent flows. The existing terms of the standard kw model have been modified to include transitional flow effects, within the framework of Reynoldsaveraged, eddyviscosity turbulence modeling. The new model has been implemented into the commercially available flow solver FLUENT and the Mississippi State University SimCenter developed flow solver U2NCLE. Test cases included flow over a flat plate, a 2D circular cylinder in a crossflow, a 3D cylindrical body and three conical geometries, which represent the nosecones of aerodynamic vehicles such as missiles. The results illustrate the ability of the model to yield reasonable predictions of transitional flow behavior using a simple modeling framework, including an appropriate response to freestream turbulence quantities, boundarylayer separation, and angle of attack.

3 
Parallel, Blockbased, Adaptive Mesh Refinement, Finitevolume Scheme for Solution of Threedimensional Favreaveraged NavierStokes EquationsPrasad, Shawn Shamendra 16 July 2013 (has links)
A parallel, blockbased, adaptive mesh refinement, finitevolume scheme is developed and validated for the solution of the FavreAveraged NavierStokes equations governing threedimensional flow of a polytropic gas. The twoequation komega turbulence model is used to model the unresolved turbulent scales and their influence on the mean solution. The finitevolume spatial discretization is accomplished by using a finitevolume procedure on multiblock, bodyfitted, hexahedral mesh. The inviscid flux functions make use of Roe's approximate Riemann solver. The viscous flux is evaluated using a diamond path reconstruction procedure on each cell boundary. Verification and validation of the solution method is accomplished through the application of the algorithm to a number of flow problems. The results from the application of the solution method to the flow problems are in good agreement with available experimental data. Therefore, the validity of the solution method for solving threedimensional, turbulent flows is confirmed.

4 
Parallel, Blockbased, Adaptive Mesh Refinement, Finitevolume Scheme for Solution of Threedimensional Favreaveraged NavierStokes EquationsPrasad, Shawn Shamendra 16 July 2013 (has links)
A parallel, blockbased, adaptive mesh refinement, finitevolume scheme is developed and validated for the solution of the FavreAveraged NavierStokes equations governing threedimensional flow of a polytropic gas. The twoequation komega turbulence model is used to model the unresolved turbulent scales and their influence on the mean solution. The finitevolume spatial discretization is accomplished by using a finitevolume procedure on multiblock, bodyfitted, hexahedral mesh. The inviscid flux functions make use of Roe's approximate Riemann solver. The viscous flux is evaluated using a diamond path reconstruction procedure on each cell boundary. Verification and validation of the solution method is accomplished through the application of the algorithm to a number of flow problems. The results from the application of the solution method to the flow problems are in good agreement with available experimental data. Therefore, the validity of the solution method for solving threedimensional, turbulent flows is confirmed.

5 
kε turbulence modeling for a wind turbine : Comparison of RANS simulations with ECN wind turbine test site Wieringermeer (EWTW) measurementsEREK, ERMAN January 2011 (has links)
In this report we discuss the use of kε RANS (Reynoldsaveraged NavierStokes equations) turbulence model for wind turbine applications. This model has been implemented in the new wind turbine wake CFD code that is being developed at ECN. Simulations of the wind turbine test site EWTW are compared with measurements conducted between 2005 and 2009 and with FarmFlow, ECN's current wind turbine wake code. Based on the results the uncertainties in the current approach are highlighted and areas for possible improvement are discussed.

6 
Anisotropic Turbulence Models for Wakes in an Active Ocean EnvironmentWall, Dylan Joseph 13 July 2021 (has links)
A set of secondmoment closure turbulence models are implemented for the study of wake evolution in an oceanic environment. The effects of density stratification are considered, and the models are validated against laboratory experiments mimicking the stratified ocean environment, and against previous experimental study of wakes subjected to a density stratification. The turbulence models are found to reproduce a number of important behaviors which differentiate stratified wakes from those in a homogeneous environment, including the appropriate decay rates in turbulence quantities, buoyant suppression of turbulence length scales, and canonical stages in wake evolution. The existence of background turbulence is considered both through the introduction of production terms to the turbulence model equations and the replication of scaleresolved simulations of wakes embedded in turbulence. It is found that the freestream turbulence causes accelerated wake growth and faster decay of wake momentum. Wakes are then simulated at a variety of Re and Fr representative of fullscale vehicles operating in an ocean environment, to downstream distances several orders of magnitude greater than existing RANS studies. The models are used to make some general predictions concerning the dependence of latewake behavior on these parameters, and specific insights into expected behavior are gained. The wake turbulence is classified using "fossil turbulence" and stratification strength criteria from the literature. In keeping with experimentally observed behavior, the stratification is predicted to increase wake persistence. It is also predicted that, regardless of initial Re or F r, the wake turbulence quickly becomes a mixture of overturning eddies and internal waves. It is found that the high Re wakes eventually become strongly affected by the stratification, and enter the stronglystratified or LAST regime. Additional model improvements are proposed based on the predicted late wake behavior. / Doctor of Philosophy / A set of advanced turbulence models are implemented and used to study ship wakes in an oceanic environment. The flows in the ocean are subject to a density stratification due to changes in temperature and salinity; the associated effects are included in the turbulence models. The models are validated against laboratory experiments mimicking the stratified ocean environment, and against previous experimental study of wakes subjected to a density stratification. The turbulence models are found to reproduce a number of important behaviors expected under such conditions based on experimental study. Additional modifications are made to the models to include the effect of preexisting freestream turbulence. Wakes are then simulated under conditions representative of fullscale vehicles operating in an ocean environment. The models are used to make some general predictions concerning latewake behavior. Specific insights into expected behavior are gained. The wake turbulence is classified using ``fossil turbulence'' and stratification strength criteria from the literature. In keeping with experimentally observed behavior, the stratification is predicted to increase wake persistence. Additional model improvements are proposed based on the predicted late wake behavior.

7 
Implementation and Validation of a Modified NonEquilibrium Wilcox K Omega Turbulence Model in Subsonic and Transonic Flow RegimesKudla, Thomas Lucas 30 August 2013 (has links)
No description available.

8 
Toward an Understanding of the Breakdown of Heat Transfer Modeling in Reciprocating FlowsPond, Ian 01 January 2015 (has links)
Reynolds average NavierStokes (RANS) modeling has established itself as a critical design tool in many engineering applications, thanks to its superior computational efficiency. The drawbacks of RANS models are well known, but not necessarily well understood: poor prediction of transition, nonequilibrium flows, mixing and heat transfer, to name the ones relevant to our study. In the present study, we use a direct numerical simulation (DNS) of a reciprocating channel flow driven by an oscillating pressure gradient to test several low and highReynolds' RANS models. Temperature is introduced as a passive scalar to study heat transfer modeling. LowReynolds' models manage to capture the overall physics of wall shear and heat flux well, yet with some phase discrepancies, whereas highReynolds' models fail. We have derived an integral method for wall shear and wall heat flux analysis, which reveals the contributing terms for both metrics. This method shows that the qualitative agreement appears more serendipitous than driven by the ability of the models to capture the correct physics. The integral method is shown to be more insightful in the benchmarking of RANS models than the typical comparisons of statistical quantities. This method enables the identification of the sources of discrepancies in energy budget equations. For instance, in the wall heat flux, one model is shown to have an out of phase dynamic behavior when compared to the benchmark results, demonstrating a significant issue in the physics predicted by this model. Our study demonstrates that the integral method applied to RANS modeling yields information not previously available that should guide the derivation of physically more accurate models.

9 
PANS method of turbulence: simulation of high and low Reynolds number flows past a circular cylinderLakshmipathy, Sunil 12 April 2006 (has links)
The objective of the study is to investigate the capability of PANS (Partially
Averaged NavierStokes Simulation) model over a wide range of Reynolds numbers and
flow physics. In this regard, numerical simulations of turbulent flow past a circular
cylinder are performed at ReD 140,000 and ReD 3900 using the PANS model. The high
Reynolds number PANS results are compared with experimental results from Cantwell
and Coles, Large Eddy Simulation results from Breuer, and Detached Eddy Simulation
results from Travin et al. Low Reynolds number PANS results are compared with
experimental results from Ong and Wallace and Large Eddy Simulation results from
Breuer. The effects of the various PANS parameters (fk, fε, σku, σεu) on the ability to
capture turbulence physics at various Reynolds numbers are studied. It is confirmed, as
previously predicted from theoretical considerations that: (i) for high Reynolds number
flow fε = 1 and σku = σk Ã fk2 / fε are most appropriate; and (ii) for low Reynolds number
flow fε = fk and σku = σk are most suitable. These choices for the parameters stem from
the fact that there is no clear separation of scales between the energy scales and the
dissipation scales at low Reynolds number unlike in the high Reynolds number where
there is a clear separation of scales between the energy containing scales and the
dissipation scales. Also, in both cases it is found that decreasing fk leads to improved
accuracy in predicting the flow statistics.

10 
The influence of thunderstorm downbursts on wind turbine designNguyen, Hieu Huy, 1980 14 November 2013 (has links)
The International Electrotechnical Commission (IEC) standard 614001 for the design of wind turbines does not explicitly address sitespecific conditions associated with anomalous atmospheric events or conditions. Examples of such offstandard atmospheric conditions include thunderstorm downbursts, hurricanes, tornadoes, lowlevel jets, etc. This study is focused on the simulation of thunderstorm downbursts using a deterministicstochastic hybrid model and the prediction of wind turbine loads resulting from these simulated downburst wind fields. The wind velocity field model for thunderstorm downburst simulation is first discussed; in this model, downburst winds are generated separately from nonturbulent and turbulent parts. The nonturbulent part is based on an available analytical model (with some modifications), while the turbulent part is simulated as a stochastic process using standard turbulence power spectral density functions and coherence functions. Tower and rotor loads are generated using simulation of the aeroelastic response for models of utilityscale wind turbines. The main objective is to improve our understanding from the point of view of design so that we may begin to address transient events such as thunderstorm downbursts based on the simulations carried out in this research study. The study discusses as well the role of control systems (for blade pitch and turbine yaw), of models for representing transient turbulence characteristics, and of correlated demand and loads on multiple units in turbine arrays during thunderstorm downbursts. / text

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