Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Sewall, Evan A.; Tafti, Danesh K.; Graham, A.B.; Thole, Karen A.

doi:10.1016/j.ijheatfluidflow.2005.08.010

Cited by 94 publications

(43 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These high levels persist in the RMS components of velocity at x = 1.0 and z = 0.5. In addition to these features, localized secondary flows are formed which result in lateral flow impingement near the ribs [20]. The IBM captures all the major features of the flow with some slight quantitative differences in the predicted turbulent quantities.…”

Section: Introductionmentioning

confidence: 92%

Large eddy simulation for predicting turbulent heat transfer in gas turbines

Tafti

Nagendra

2014

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

Blade cooling technology will play a critical role in the next generation of propulsion and power generation gas turbines. Accurate prediction of blade metal temperature can avoid the use of excessive compressed bypass air and allow higher turbine inlet temperature, increasing fuel efficiency and decreasing emissions. Large eddy simulation (LES) has been established to predict heat transfer coefficients with good accuracy under various non-canonical flows, but is still limited to relatively simple geometries and low Reynolds numbers. It is envisioned that the projected increase in computational power combined with a drop in price-to-performance ratio will make system-level simulations using LES in complex blade geometries at engine conditions accessible to the design process in the coming one to two decades. In making this possible, two key challenges are addressed in this paper: working with complex intricate blade geometries and simulating high-Reynolds-number ( Re ) flows. It is proposed to use the immersed boundary method (IBM) combined with LES wall functions. A ribbed duct at Re =20 000 is simulated using the IBM, and a two-pass ribbed duct is simulated at Re =100 000 with and without rotation (rotation number Ro =0.2) using LES with wall functions. The results validate that the IBM is a viable alternative to body-conforming grids and that LES with wall functions reproduces experimental results at a much lower computational cost.

show abstract

Section: Introductionmentioning

confidence: 92%

Large eddy simulation for predicting turbulent heat transfer in gas turbines

Tafti

Nagendra

2014

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Comparison is made with the aerodynamics and heat transfer data of [6] at a Reynolds number of 20,000, that of the current simulations. For heat transfer, which is more difficult to accurately 1 In future, the use of a variable Pr T may offer some benefit.…”

Section: Experimental Data Sourcesmentioning

confidence: 99%

“…Yoshizawa -Leray C L qa 2 u i;k u k;j þ u i;k u j;k Â Ã a Caqa 2 u i;k u k;j þ u i;k u j;k À u k;i u k;j Â Ã Kosović C K qa 2 u i;k u k;j þ 3u i;k u j;k À u k;i u k;j Â Ã predict, comparison is also made with the Re ¼ 30; 000 data of [33,6]. The geometry of [33] is comparable (h=D ¼ 0:1 and D=h ¼ 9) with the current study (h=D ¼ 0:1 and D=h ¼ 10).…”

Section: Modelmentioning

confidence: 99%

“…Both quasi-DNS and LES were found to be within 10-15% of each other and within 15-30% of experimental data dependent on mesh resolution. Sewall et al [6] investigate flow and heat transfer in the developing, fully developed, and bend regions of a ribbed duct with a 180°bend. LES matches with mean velocity, Reynolds stresses and heat transfer measurements to within 10-15%.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large eddy simulation of turbine internal cooling ducts

Tyacke

Tucker

2015

Computers & Fluids

View full text Add to dashboard Cite

a b s t r a c tLarge-Eddy Simulation (LES) and hybrid Reynolds-averaged Navier-Stokes-LES (RANS-LES) methods are applied to a turbine blade ribbed internal duct with a 180°bend containing 24 pairs of ribs. Flow and heat transfer predictions are compared with experimental data and found to be in agreement. The choice of LES model is found to be of minor importance as the flow is dominated by large geometric scale structures. This is in contrast to several linear and nonlinear RANS models, which display turbulence model sensitivity. For LES, the influence of inlet turbulence is also tested and has a minor impact due to the strong turbulence generated by the ribs. Large scale turbulent motions destroy any classical boundary layer reducing near wall grid requirements. The wake-type flow structure makes this and similar flows nearly Reynolds number independent, allowing a range of flows to be studied at similar cost. Hence LES is a relatively cheap method for obtaining accurate heat transfer predictions in these types of flows.

show abstract

“…Sewall et al [3], placing the tube into a fixed internal elements flow and heat transfer characteristics were determined experimentally. Kamali and Binesh [4] examined the heat transfer occurring in a square cross section of the inner member is placed in pairs have different geometry and friction channel numerically.…”

Section: Introductionmentioning

confidence: 99%

Effect Of Heat Transfer Enhancement In Inner Tube With Apparatus

Güngör¹,

Gungor²,

Faruk³

2016

Fourth International Conference on Advances in Mechanical and Robotics Engineering - AMRE 2016

View full text Add to dashboard Cite

In recent century due to technological advances and population have increased energy demand. Energy save and energy use efficiency has become important topic. Energy production, transmission process is related to heat transfer. When the heat transfer is enhancing at energy process, energy efficiency will increase. The heat transfer enhancement techniques are widely used in many applications in the heating process. These techniques are classified as active and passive techniques. The objective of this study is to increase heat transfer efficiencies in tube with passive techniques. For this purpose, various apparatus will place into inner tubes which increase the heat transfer surfaces. The experiments were performed with 3 different type apparatus. It was compare and analyzed efficiency of apparatus types.

show abstract

Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Cited by 94 publications

References 60 publications

Large eddy simulation for predicting turbulent heat transfer in gas turbines

Large eddy simulation for predicting turbulent heat transfer in gas turbines

Large eddy simulation of turbine internal cooling ducts

Effect Of Heat Transfer Enhancement In Inner Tube With Apparatus

Contact Info

Product

Resources

About