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A special issue of Computation (ISSN 2079-3197). This special issue belongs to the section "Computational Engineering".

Deadline for manuscript submissions: closed (31 August 2018) | Viewed by 26121

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Prof. Dr. Ali Cemal Benim

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Guest Editor

Center of Flow Simulation (CFS), Department of Mechanical and Process Engineering, Duesseldorf University of Applied Sciences, D-40476 Duesseldorf, Germany
Interests: computational methods; combustion; fire; turbulence; multi-phase flows; environmental flow; fluid machinery; biofluid dynamics
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Prof. Dr. Inż Jan Taler

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Guest Editor

Institute of Thermal Power Engineering, Politechnika Krakowska, 31-864 Krakow, Poland
Interests: power engineering; thermodynamics; heat transfer; inverse heat transfer problems; steam boiler dynamics; thermal stresses
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Prof. Dr. Abdulmajeed A. Mohamad

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Guest Editor

Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Interests: energy; porous media; heat and mass transfer; computational
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will publish a set of selected papers from the XI International Conference on Computational Heat, Mass, and Momentum Transfer (ICCHMT 2018), which will be held during May 21-24 2018, in Cracow, Poland (the deadline for abstract submissions is 28 February 2018). The selected papers will be published free of charge. There will also be an ICCHMT-Computation Best Paper Award. You are invited to submit a contribution to the conference for consideration and possible publication in this Special Issue. Topics of the conferences are, but not limited to, the following:

Advanced Numerical Methods
Aeronautical and Space Applications
Bio-Fluidics and Biomedical Engineering
Bio-Inspired Flow and Heat Transfer
Building-Integrated Energy and Power Systems
Buoyancy-Driven Flows
Compressible Flows
Double Diffusive Convection
Energy Saving Processes
Fluid Machinery
Granular Flows
Heat Exchangers/Heat Pipe
Heat and Mass Transfer in Manufacturing and Materials Processing
Heat and Mass Transfer in Nuclear Applications
Heat and Mass Transfer in Particle-Laden Flows
Hear and Mass Transfer in Porous Media
Internal Flow and Heat Transfer
Micro/Nano Heat and Mass Transfer
Mixing Devices and Phenomena
Multi-Phase Flows
Optimization in Thermal Engineering
Steam and Gas Turbines
Technology for Renewable Energy Sources
Transport Phenomena in Porous Media
Waste Management and Waste Disposal

For detailed information on all further aspects of the conference including the dates, keynote speakers, committes, registration, and accomodation, please check the conference website at: www.icchmt.conrego.pl.

Prof. Dr. Ali Cemal Benim
Prof. Dr. Jan Taler
Prof. Dr. Abdulmajeed A. Mohamad
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Computation is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Numerical Methods
Engineering Applications
Fluid Flow
Heat Transfer
Mass Transfer

Published Papers (6 papers)

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Research

15 pages, 63224 KiB

Open AccessArticle

Computational Analysis of the Performance Characteristics of a Supercritical CO₂ Centrifugal Compressor

by Senthil Kumar Raman and Heuy Dong Kim

Computation 2018, 6(4), 54; https://doi.org/10.3390/computation6040054 - 19 Oct 2018

Cited by 6 | Viewed by 4066

Abstract

A centrifugal compressor working with supercritical CO

_{2}

(S-CO

_{2}

) has several advantages over other supercritical and conventional compressors. S-CO

_{2}

is as dense as the liquid CO

_{2}

and becomes difficult to compress. Thus, during the operation, the S-CO

_{2}

centrifugal [...] Read more.

A centrifugal compressor working with supercritical CO

_{2}

(S-CO

_{2}

) has several advantages over other supercritical and conventional compressors. S-CO

_{2}

is as dense as the liquid CO

_{2}

and becomes difficult to compress. Thus, during the operation, the S-CO

_{2}

centrifugal compressor requires lesser compression work than the gaseous CO

_{2}

. The performance of S-CO

_{2}

compressors is highly varying with tip clearance and vanes in the diffuser. To improve the performance of the S-CO

_{2}

centrifugal compressor, knowledge about the influence of individual components on the performance characteristics is necessary. This present study considers an S-CO

_{2}

compressor designed with traditional engineering design tools based on ideal gas behaviour and tested by SANDIA national laboratory. Three-dimensional, steady, viscous flow through the S-CO

_{2}

compressor was analysed with computational fluid dynamics solver based on the finite volume method. Navier-Stokes equations are solved with K-

ω

(SST) turbulence model at operating conditions in the supercritical regime. Performance of the impeller, the main component of the centrifugal compressor is compared with the impeller with vaneless diffuser and vaned diffuser configurations. The flow characteristics of the shrouded impeller are also studied to analyse the tip-leakage effect. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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11 pages, 2970 KiB

Open AccessArticle

Numerical Study on Sloshing Characteristics with Reynolds Number Variation in a Rectangular Tank

by Hyunjong Kim, Mohan Kumar Dey, Nobuyuki Oshima and Yeon Won Lee

Computation 2018, 6(4), 53; https://doi.org/10.3390/computation6040053 - 12 Oct 2018

Cited by 11 | Viewed by 3542

Abstract

A study on sloshing characteristics in a rectangular tank, which is horizontally excited with a specific range of the Reynolds number, is approached numerically. The nonlinearity of sloshing flow is confirmed by comparing it with the linear solution based on the potential theory, and the time series results of the sloshing pressure are analyzed by Fast Fourier Transform (FFT) algorithm. Then, the pressure fluctuation phenomena are mainly observed and the magnitude of the amplitude spectrum is compared. The results show that, when the impact pressure is generated, large pressure fluctuation in a pressure cycle is observed, and the effects of the frequencies of integral multiples when the fundamental frequency appears dominantly in the sloshing flow. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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17 pages, 1338 KiB

Open AccessArticle

Immersed Boundary Method Application as a Way to Deal with the Three-Dimensional Sudden Contraction

by Jonatas E. Borges, Marcos Lourenço, Elie L. M. Padilla and Christopher Micallef

Computation 2018, 6(3), 50; https://doi.org/10.3390/computation6030050 - 07 Sep 2018

Cited by 4 | Viewed by 6443

Abstract

The immersed boundary method has attracted considerable interest in the last few years. The method is a computational cheap alternative to represent the boundaries of a geometrically complex body, while using a cartesian mesh, by adding a force term in the momentum equation. The advantage of this is that bodies of any arbitrary shape can be added without grid restructuring, a procedure which is often time-consuming. Furthermore, multiple bodies may be simulated, and relative motion of those bodies may be accomplished at reasonable computational cost. The numerical platform in development has a parallel distributed-memory implementation to solve the Navier-Stokes equations. The Finite Volume Method is used in the spatial discretization where the diffusive terms are approximated by the central difference method. The temporal discretization is accomplished using the Adams-Bashforth method. Both temporal and spatial discretizations are second-order accurate. The Velocity-pressure coupling is done using the fractional-step method of two steps. The present work applies the immersed boundary method to simulate a Newtonian laminar flow through a three-dimensional sudden contraction. Results are compared to published literature. Flow patterns upstream and downstream of the contraction region are analysed at various Reynolds number in the range

44 \leq R e_{D} \leq 993

for the large tube and

87 \leq R e_{D} \leq 1956

for the small tube, considerating a contraction ratio of

β = 1.97

. Comparison between numerical and experimental velocity profiles has shown good agreement. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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13 pages, 6039 KiB

Open AccessArticle

Numerical Investigation of Film Cooling Enhancement Using an Upstream Sand-Dune-Shaped Ramp

by Sheng-Chang Zhang, Jing-Zhou Zhang and Xiao-Ming Tan

Computation 2018, 6(3), 49; https://doi.org/10.3390/computation6030049 - 04 Sep 2018

Cited by 11 | Viewed by 4131

Abstract

Film cooling enhancement by incorporating an upstream sand-dune-shaped ramp (SDSR) to the film hole exit was numerically investigated on a flat plate under typical blowing ratios ranging from 0.5 to 1.5. Three heights of SDSRs were designed: 0.25D, 0.5D, and 0.75D. The results indicated that the upstream SDSR effectively controlled the near-wall primary flow and subsequent mutual interaction with the coolant jet, which was the main mechanism of the film cooling enhancement. First, a pair of anti-kidney vortices was formed at the trailing ridges of the SDSR, which helped suppress the kidney vortex pair due to the interaction between the coolant jet and the primary flow. Second, a weak separation and a low pressure zone were induced behind the backside of the SDSR, which caused the coolant jet to spread around the film cooling hole and improve the lateral film coverage. With respect to the baseline cylindrical film cooling holes, the effect of the upstream SDSR was distinct under different blowing ratios. Under a low blowing ratio, the upstream SDSR shortened the streetwise film layer coverage in the vicinity of the film hole centerline but increased the span-wise film layer coverage. A relatively optimal ramp height seemed to be 0.5D. Under a high blowing ratio, both the streamwise and span-wise film layer coverages improved in comparison with the baseline case. The film cooling effectiveness improved gradually with increasing ramp height. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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14 pages, 2693 KiB

Open AccessArticle

Determination of Aerosol Size Distribution from Angular Light-Scattering Signals by Using a SPSO-DE Hybrid Algorithm

by Zhen-Zong He, Jun-Kui Mao and Xing-Si Han

Computation 2018, 6(3), 47; https://doi.org/10.3390/computation6030047 - 29 Aug 2018

Cited by 3 | Viewed by 3766

Abstract

The comparison of the angular light-scattering method (ALSM) and the spectral extinction method (SEM) in solving the inverse problem of aerosol size distribution (ASD) are studied. The inverse problem is solved by a SPSO-DE hybrid algorithm, which is based on the stochastic particle swarm optimization (SPSO) algorithm and differential evolution (DE) algorithm. To improve the retrieval accuracy, the sensitivity analysis of measurement signals to characteristic parameters in ASDs is studied; and the corresponding optimal measurement angle selection region for ALSM and optimal measurement wavelength selection region for SEM are proposed, respectively. Results show that more satisfactory convergence properties can be obtained by using the SPSO-DE hybrid algorithm. Moreover, short measurement wavelengths and forward measurement angles are beneficial to obtaining more accurate results. Then, common monomodal and bimodal ASDs are estimated under different random measurement errors by using ALSM and SEM, respectively. Numerical tests show that retrieval results by using ALSM show better convergence accuracy and robustness than those by using SEM, which is attributed to the distribution of the objective function value. As a whole, considering the convergence properties and the independence on prior optical information, the ALSM combined with SPSO-DE hybrid algorithm provides a more effective and reliable technique to obtain the ASDs. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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12 pages, 3670 KiB

Open AccessArticle

The Hydraulic Cavitation Affected by Nanoparticles in Nanofluids

by Min-Rui Chen, Jin-Yuan Qian, Zan Wu, Chen Yang, Zhi-Jiang Jin and Bengt Sunden

Computation 2018, 6(3), 44; https://doi.org/10.3390/computation6030044 - 06 Aug 2018

Cited by 1 | Viewed by 3370

Abstract

When liquids flow through a throttling element, the velocity increases and the pressure decreases. At this point, if the pressure is below the saturated vapor pressure of this liquid, the liquid will vaporize into small bubbles, causing hydraulic cavitation. In fact, a vaporization nucleus is another crucial condition for vaporizing, and particles contained in the liquid can also work as the vaporization nuclear. As a novel heat transfer medium, nanofluids have attracted the attention of many scholars. The nanoparticles contained in the nanofluids play a significant role in the vaporization of liquids. In this paper, the effects of the nanoparticles on hydraulic cavitation are investigated. Firstly, a geometric model of a perforated plate, the throttling element in this paper, is established. Then with different nanoparticle volume fractions and diameters, the nanofluids flowing through the perforated plate are numerically simulated based on a validated numerical method. The operation conditions, such as the ratio of inlet to outlet pressures and the temperature are the considered variables. Additionally, cavitation numbers under different operating conditions are achieved to investigate the effects of nanoparticles on hydraulic cavitation. Meanwhile, the contours are extracted to research the distribution of bubbles for further investigation. This study is of interest for researchers working on hydraulic cavitation or nanofluids. Full article

(This article belongs to the Special Issue Computational Heat, Mass and Momentum Transfer)

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