Relevant bibliographies by topics / VOF simulace

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'VOF simulace'

Author: Grafiati
Published: 28 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "VOF simulace"

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Zhang, Hong Qing, Xian Tang Zhang, Yi Long Lou, and Wei Ping Xing. "Comparative Analysis of Wind Speed in Ventilation Hole Simulated by VOF and Euler Model." Applied Mechanics and Materials 624 (August 2014): 643–46. http://dx.doi.org/10.4028/www.scientific.net/amm.624.643.

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In order to analysis the applicability of VOF and Euler models to simulate water-air two-phase flow, VOF model and Euler model, respectively combining turbulent model, were used to simulate wind speed in ventilation hole of working gate in a hydropower station spillway tunnel with high head and large discharge in China. The results show that the dragging force simulated by Euler model is much more effective than that simulated by VOF model, causing significant increase of airflow in ventilation hole. It is obviously that wind speed simulated by Euler model is more close to the measured one, which may also provide evidence for design of ventilation hole. So Euler model is a better method to simulate the characteristic of aerated flow than VOF model. Meanwhile, the maximum wind speed occur near the inlet of ventilation hole, and the maximum value of wind speed is close to 120 m/s, which can cause loud noise. And wind speed distribution on the inlet section and outlet section of ventilation hole is respectively the most non-uniform and uniform. The conclusions obtained can improve the design of ventilation hole.
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Zhang, Hong Qing, Yi Long Lou, Wei Ping Xing, and Jun Jun Tan. "Numerical Simulation of Ventilation Characteristics in a Hydropower Station Spillway Tunnel with High Head and Large Discharge." Advanced Materials Research 926-930 (May 2014): 3527–30. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.3527.

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High wind speedandloudnoise usually occur in the hydropower station spillway tunnel, which will impact the producing environment of operators. In this paper, turbulent model and VOF modelwere combinedto simulate wind speed and the volume of ventilated airin ventilation holeandthreeaeratorsin the spillway tunnel on the right bank of a hydropower station in China. The results show thatVOF modelcan well simulate ventilated air induced by water drag, andthe volume of ventilated air in ventilation hole is the largest.Wind speed distribution on the longitudinal sectionof the inlet of ventilation hole is non-uniform,and loud noisewill occurthere. Wind speed on the left side of three aerators is higher than that on the right side. The results of the volume of ventilated airin threeaerators simulated by VOF modelare credible, but we should improve the VOF model to more accurately simulate aerated flow.
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Yang, Jie, Yu Xin Ren, and Shou Mei Xiong. "Numerical Simulation of Die-Casting Mold Filling Process by Using Fractional Step Method." Materials Science Forum 575-578 (April 2008): 104–8. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.104.

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In the numerical simulation of mold filling process, the calculation efficiency has been a key point for practical applications due to the complexity and thin-section of die castings. In current research work, a fractional step method was applied in the solution of the unsteady Navier-Stokes equations, which can be implemented with a single solution to the momentum/pressure equations at each time step. This method may avoid the decrease in efficiency induced by iteration. A water analog system was designed and developed to simulate the die casting process. The flow patterns were recorded by a high speed camera with a capturing rate of 500 frames per second. The simulation results were consistent with the experimental ones. Besides, the fluid flow patterns of several components were simulated by the fractional step and VOF algorithm, and the SOLA-VOF algorithm respectively. The simulation results showed that the combination of the fractional step method and VOF method can improve the computational efficiency to some extent in numerical simulation of mold filling process.
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Samuel, Samuel, Andi Trimulyono, and Ari Wibawa Budi Santosa. "Simulasi CFD pada Kapal Planing Hull." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 16, no. 3 (November 13, 2019): 123–28. http://dx.doi.org/10.14710/kapal.v16i3.26397.

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Akurasi dalam memprediksi hambatan kapal adalah salah satu aspek penting dalam mendesain lambung kapal. Secara umum, hambatan kapal dengan type planing lebih rumit daripada type displacement. Planing hull memiliki karakteristik unik seperti trim, heave, hard-chine, Froude number tinggi dan dead-rise angle. Gaya hidrodinamik pada planing hull lebih dominan daripada gaya hidrostatik. Analisis numerik menggunakan Finite Volume Method (FVM) dipilih untuk menyelesaikan masalah hidrodinamik. Dalam penelitian ini, persamaan (RANS Reynolds-Averaged Navier-Stokes) digunakan untuk menggambarkan model turbulensi dengan k-ε. Secara umum, pemodelan Volume of Fluid (VOF) menggunakan aliran multiphase Euler yang diasumsikan air dan udara sebagai phase. Tujuan dari penelitian ini adalah untuk memperkenalkan perhitungan kapal type planing hull untuk memprediksi hambatan kapal dan seakeeping. Studi validasi ini dilakukan dengan menggunakan eksperimen Fridsma hullform. Hasil pada penelitian ini menunjukkan bahwa simulasi numerik pada jenis planing hull dapat diprediksi dengan akurasi yang cukup baik.
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Liu, Y. L., B. Lv, and W. L. Wei. "Large Eddy Simulation of Gas-Liquid Two-Phase Flow for a Nested Type Fixed-Cone Valve." Applied Mechanics and Materials 170-173 (May 2012): 2458–63. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2458.

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large eddy simulation cooperated with a physical fractional-step method is applied to simulate steady flow around a nested type fixed-cone valve; and the equations are solved with the finite volume method. The free fluid surface is simulated by the VOF method. The pressure contours and vorticity magnitude are obtained. The modeling results conform to physical law, and show that the large eddy simulation theory has powerful capacity in simulation of microstructures of turbulent flows, and the function of the nested type fixed-cone valve for energy dissipating is good.
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Cao, Wen Jiong, Shou Bin Dong, Xin Wei Lu, and Zhao Yao Zhou. "Numerical Simulation of Filling Process in HPDC by Lattice Boltzmann Method." Advanced Materials Research 717 (July 2013): 354–58. http://dx.doi.org/10.4028/www.scientific.net/amr.717.354.

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A general lattice Boltzmann Method (LBM) to simulate filling process of high pressure die casting (HPDC) is investigated. Boundary conditions are studied and the free surface model is established by combine the LBM with VOF method. The final model was substantiated by simulating filling process in HPDC in three dimensions. The simulated results from LBM and finite difference method (FDM) were compared with the experiments. The results show the former is in a better agreement with experiments. It demonstrates the efficiency and precision of this LBM model in describing flow pattern in filling process.
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Rahaman, Md Mashiur, Hiromichi Akimoto, and Md Ashim Ali. "Numerical simulation of 2D hydrodynamic impact of wedge and ship section at variable velocity." Journal of Naval Architecture and Marine Engineering 10, no. 1 (June 29, 2013): 49–58. http://dx.doi.org/10.3329/jname.v10i1.14383.

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A commercial CFD code Fluent 6.3® is used to simulate non-linear free surface flow and compute the impact load during variable velocity water entry of 2D wedge and ship section. The code uses the finite volume method to solve the conservation of mass and momentum equations to obtain simulated flow field. The interface between water and air was modeled using volume of fluid (VOF) method. Wedge section with 30 degree dead-rise angle and a ship section are numerically simulated. Time history of impact force and pressures at distinct locations are predicted; and compared with existing experimental results and other numerical methods. Present numerical results compare well with experimental measurements.DOI: http://dx.doi.org/10.3329/jname.v10i1.14383
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Shang, Zhi, Jing Lou, and Hongying Li. "Simulations of Flow Transitions in a Vertical Pipe Using Coupled Level Set and VOF Method." International Journal of Computational Methods 14, no. 02 (February 22, 2017): 1750013. http://dx.doi.org/10.1142/s021987621750013x.

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The level set (LS) and volume-of-fluid (VOF) methods are usually employed to simulate the two-phase flow. However every single method of them will face the mass conservative or accurate issues during the simulation. The coupled level set and volume-of-fluid (CLSVOF) method was not only able to conquer the shortages of the LS and VOF methods but also simultaneously keep the merits of both of the methods. In CLSVOF method the geometry reconstruction technology was employed to realize the coupling between LS and VOF. After the validation of single bubble rising cases, the CLSVOF method was used to simulate the complex transitional two-phase flows in a vertical pipe and the simulation results were compared to experiments.
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Zhang, Wei, You Hong Tang, Cheng Bi Zhao, and Cheng Zhang. "A Two-Phase Flow Model with VOF for Free Surface Flow Problems." Applied Mechanics and Materials 232 (November 2012): 279–83. http://dx.doi.org/10.4028/www.scientific.net/amm.232.279.

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A numerical model based on the two-phase flow model for incompressible viscous fluid with a complex free surface has been developed in this study. The two-step projection method is employed to solve the Navier–Stokes equations in the numerical solutions, and finite difference method on a staggered grid is used throughout the computation. The two-order accurate volume of fluid (VOF) method is used to track the distorted and broken free surfaces. The two-phase model is first validated by simulating the dam break over a dry bed, in which the numerical results and experimental data agree well. Then 2-D fluid sloshing in a horizontally excited rectangular tank at different excitation frequencies is simulated using this two-phase model. The results of this study show that the two-phase flow model with VOF method is a potential tool for the simulation of nonlinear fluid sloshing. These studies demonstrate the capability of the two-phase model to simulate free surface flow problems with considering air movement effects.
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Suthanarak, Nawaporn, and Navaphattra Nunak. "A CFD study on wall shear stress of falling water film on food contact surface." MATEC Web of Conferences 192 (2018): 03052. http://dx.doi.org/10.1051/matecconf/201819203052.

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This paper proposes a CFD model to simulate the wall shear stress of the falling water film on the hydrophilic surface (aluminum) of the inclined flat plate in the range of 30°, 60° and 90° at a flow rate of 100, 200 and 300 L/h. Wall shear stress simulated from the CFD using SST k-ω with the VOF model was compared with the real data obtained from the experiment. It was found that both inclined angle and water flow rate had an effect to the wall shear stress and the CFD with the proposed model had the potential to predict it with the maximum averaged error of 2.9%.
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Dissertations / Theses on the topic "VOF simulace"

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Lunda, Filip. "Studium proudění na rozhraní nemísitelných kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444285.

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This theses deals with flow of two immisible fluid in horizontal pipeline. First part teoretically describes immisible flow. What follows is experimental measurement in wich experimental track was adjusted for inlet of oil from the top. Water and corn germ oil were used as fluids. There were observed many modes of flow on the track. After that PIV was described and measured. PIV was done for measurement of values of velocity vectors. Simulation of one chosen mode was developed in the last chapter. This simulation was done in Ansys Fluent with help of VOF method. Simulation was done both in 3D and 2D pipeline. In the end these simulation were compared with experiment measurement and were critically evaluated.
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Malá, Kateřina. "Studium proudění nemísitelných kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416440.

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This thesis explores the topic of flow of two immiscible liquids in horizontal pipeline. For this purpose, the experimental apparatus has been set up, that allows to observe the flow of mixture through the transparent pipe. Moderately viscous oil and water (viscosity ratio: 52,81, density ratio: 0.86, interfacial tension: 41,64 mN/m) have been chosen for the experiment. Both fluids were introduced into the pipe through a T-junction. At the end of the apparatus, a mixture of liquids flowed into the separation tank, where both phases were separated. The separated oil was then reused for further measurements. The oil and water flow rates could be individually changed by use control valves, that led to identification of different flow regimes. These varied from stratified flows to fully dispersed ones as the mixture speed increased. All observed flow regimes were plotted in the flow map, that is a function of the inlet velocities of both fluids. For further analysis, a second type of flow map has been created that displays rates as a function of mixture velocity and phase volume fraction. Selected regime was also simulated using software ANSYS FLUENT. The VOF method was used to simulate multiphase flow. This thesis critically evaluates the results of the study and shows the direction for further research in the field of immiscible liquids flow.
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Niesner, Jakub. "Simulace stripování kyselých vod v rafinérském provozu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229172.

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This diploma thesis is focused on comparison of results from simulations programs ProMax and PRO/II. Both simulation models were based on a sour water stripping unit according to a project of CBI Lummus s.r.o. The thesis also includes a theroretical part deals with technology of sour water stripping.
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Müller, Tim. "Development of asymmetric gears with Creo Simulate." Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21514.

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Grundgedanke: • Erhöhung der Tragfähigkeit der Verzahnung (Flanke, Fuss) durch ein asymmetrisches Bezugsprofil Umsetzung: • Aufbau eines parametrischen FE-Zahnradmodells für asymmetrische Verzahnungen in Creo Simulate • Automatisierte FE-Simulation einer Vielzahl an Lösungsvarianten mit Multiziel-Konstruktionsstudie • Auswertung der Ergebnisse mit Hilfe einer Nutzerwertanalyse • Zeichnungserstellung und Fertigungsbetreuung Potenziale: • Reduzierung der Verzahnungsbreite um ca. 10%
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Andrae, René. "Wissensintegration im Simulationsumfeld von Creo Simulate durch Anwendungsprogrammierung." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-141623.

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Vorgestellt werden verschiedene Programmierschnittstellen von Creo. Des Weiteren werden Anwendungsmöglichkeiten im Bereich der konstruktionsbegleitenden Simulation (Creo Simulate) vorgestellt. Ziel ist die Entlastung des Konstrukteurs/Berechners von Routineaufgaben und die Integration von Wissen in das Simulationsmodell.
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Rumpp, Stefan. "Automatisierte Erstellung von Simulationsmodellen für einen fasergewickelten Drucktank in Creo/Simulate unter Verwendung der VB-Schnittstelle." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-172202.

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Für die Simulation eines fasergewickelten Drucktanks werden die Ergebnisdaten einer Wickelsimulation, bestehend aus Geometrieinformationen und lokalen Wickelwinkeln, von denen wiederum die Materialeigenschaften und die erforderliche Messgrößen abhängen, automatisch in ein Creo-Simulationsmodell unter Verwendung der VB-Schnittstelle umgesetzt. Weiter wird auf die Auswertung der Ergebnisse eingegangen.
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Hübner, Björn Christoph. "Simultane Analyse von Bauwerk-Wind-Wechselwirkungen." Braunschweig : Inst. für Statik, 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967804183.

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Lehrer, Michaela. "Simultane EEG-fMRT Untersuchung von schmerzevozierten Reaktionen." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-156565.

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Wirtz, Stefan. "Simultane Homogenisierung und Registrierung von Bildern histologischer Serienschnitte." Lübeck Zentrale Hochschulbibliothek Lübeck, 2010. http://d-nb.info/999666312/34.

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Körtgen, Anne-Thérèse. "Modellierung und Realisierung von Konsistenzsicherungswerkzeugen für simultane Dokumentenentwicklung." Aachen Shaker, 2009. http://d-nb.info/996002006/04.

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Books on the topic "VOF simulace"

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Weiser, Christoph. Simultane Optimierung von Preis- und Investitionsstrategien. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1.

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Weiser, Christoph. Simultane Optimierung von Preis- und Investitionsstrategien: Ein diskreter kontrolltheoretischer Ansatz. Wiesbaden: Deutscher Universitäts-Verlag, 1990.

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Kommission, Deutsche Geodätische, and Technische Universität München, eds. Simultane Schätzung von Topographie und Dynamik polarer Gletscher aus multi-temporalen SAR interferogrammen. München: Verlag der Bayerischen Akademie der Wissenschaften in Kommission beim Verlag C.H. Beck, 2004.

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Czerwinski, Peter. Gegenwärtigkeit: Simultane Räume und zyklische Zeiten, Formen von Regeneration und Genealogie im Mittelalter : Exempel einer Geschichte der Wahrnehmung II. München: Fink, 1993.

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Frauenstein, T. Objektorientierte Sprachkonzepte und diskrete Simulation: Klassifikation, Vergleich und Bewertung von Konzepten der Programmiersprachen Simula-67, Modula-2, Pascal, Smalltalk-80 und Beta aus objektorientierter Sicht vor dem Hintergrund des Anwendungsgebietes der diskreten Simulation. Berlin: Springer-Verlag, 1990.

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Elusive Conclusions Vol. I, "Simulated Fabrications". Kipcart Studio, LLC, 2011.

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Emissionsminderung 2018. VDI Verlag, 2018. http://dx.doi.org/10.51202/9783181023273.

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Inhalt Aktuelle rechtliche Rahmenbedingungen TA Luft Neufassung: Die wichtigsten geplanten Änderungen für Behörden und Betreiber. . . . . .1 R. Remus, Umweltbundesamt, Dessau-Roßlau Der Sevilla-Prozess und die Erarbeitung von BVT-Merkblättern – Sachstand und aktuelle Entwicklungen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 K. Kraus, Umweltbundesamt, Dessau-Roßlau Quecksilber – Hg: Aktuelles zur Messtechnik Adsorption von elementarem Quecksilber aus diskontinuierlichen Abluftströmen im Festbett .19 J. Ambrosy, C. Pasel, M. Luckas, D. Bathen, Lehrstuhl für Thermische Verfahrenstechnik, Universität Duisburg-Essen; M. Bittig, Institut für Energie- und Umwelttechnik e.V. (IUTA), Duisburg Prozessoptimierung durch manuelle Einzelmessungen. . . . . . . . . . . . . . . . . . . . . . . . . . .23 T. Noll, TÜV Rheinland Energy, Köln Simultane Quecksilber und SO2-Minderung mit stationären Sorptionsmodulen . . . . . . . . . . .29 O. Petzoldt, S. R...
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Tourenplanung durch Einsatz Naturanaloger Verfahren: Integration von Genetischen Algorithmen und Simulated Annealing. Deutscher Universitätsverlag, 2013.

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Signs Of Culture: Simulacra And The Real (Literary and Cultural Theory, Vol. 7). Peter Lang Pub Inc, 2000.

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(Editor), Wojciech Kalaga, and Tadeusz Rachwa (Editor), eds. Signs of Culture: Simulacra and the Real (Literary and Cultural Theory, Vol. 7). Peter Lang Pub Inc, 2000.

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Book chapters on the topic "VOF simulace"

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Lamprecht, Günther. "Verarbeitung von Texten." In Einführung in die Programmiersprache SIMULA, 48–62. Wiesbaden: Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-322-96923-1_8.

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Weiser, Christoph. "Numerische Optimierung." In Simultane Optimierung von Preis- und Investitionsstrategien, 113–66. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_5.

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Weiser, Christoph. "Dynamische Entscheidungsmodelle." In Simultane Optimierung von Preis- und Investitionsstrategien, 12–38. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_2.

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Weiser, Christoph. "Entwicklung eines eigenen Modells." In Simultane Optimierung von Preis- und Investitionsstrategien, 39–63. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_3.

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Weiser, Christoph. "Einleitung." In Simultane Optimierung von Preis- und Investitionsstrategien, 1–11. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_1.

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Weiser, Christoph. "Kontrolltheoretischer Ansatz." In Simultane Optimierung von Preis- und Investitionsstrategien, 64–112. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_4.

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Weiser, Christoph. "Strategische Implikationen." In Simultane Optimierung von Preis- und Investitionsstrategien, 167–72. Wiesbaden: Deutscher Universitätsverlag, 1990. http://dx.doi.org/10.1007/978-3-322-86221-1_6.

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Lamprecht, Günther. "Eingabe von Daten über die Standard-Eingabe." In Einführung in die Programmiersprache SIMULA, 30–36. Wiesbaden: Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-322-96923-1_5.

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Narloch, Harald, and Robert Hoyer. "Validierung von Simulationsmodellen durch Simulated Annealing." In Simulationstechnik, 201–6. Wiesbaden: Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-86541-0_35.

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Wendt, Oliver. "Kombination von genetischen Algorithmen und Simulated Annealing." In Tourenplanung durch Einsatz naturanaloger Verfahren, 145–71. Wiesbaden: Deutscher Universitätsverlag, 1995. http://dx.doi.org/10.1007/978-3-663-09046-5_7.

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Conference papers on the topic "VOF simulace"

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Al-Athel, K. S., and M. S. Gadala. "Eulerian FEA With Volume of Solid (VOS) Application in Metal Forming." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38946.

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The adaptation of the volume of fluid method (VOF) to solid mechanics (VOS) is presented in this work with the focus on metal forming applications. The method is discussed for a general non-uniform mesh with Eulerian finite element formulation. The implementation of the VOS method in metal forming applications is presented by focusing on topics such as the contact between the tool and the workpiece, tracking of the free surface of the material flow and the connectivity of the free surface during the whole process. Improvement on the connectivity of the free surface and the representation of curves is achieved by considering the mechanics of different metal forming processes. Different applications are simulated and discussed to highlight the capability of the VOS method.
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Ma, Xia, David Culp, and Brandon Smith. "Pagosa Simulation of Hypervelocity Impact and Fragmentation From Hypersonic Explosions." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-089.

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Abstract We use PAGOSA’s FLIP+MPM capability to simulate hypervelocity impact and fragmentation from hypersonic explosions. The scenario to be simulated involves a complex chain explosion from fragmentation impact which was caused by another explosion. The simulations also use the SURF model for shock to detonation transition (SDT) and the MATCH model for mechanical ignition and deflagration of high explosives. These models in PAGOSA working together are crucial for modeling complex system for real world applications. This shows the powerful modeling and predicting capability of PAGOSA that others cannot do. Since experimental data are not available for any complex scenario like this, we did verification and validation (V&V) in each separate steps, These include the fragmentation simulated by FLIP+MPM, the Shock to Detonation Transition (SDT) modeled by SURF and mechanical ignition and deflagration modeled by MATCH. PAGOSA is a shock hydrodynamics program developed at Los Alamos National Laboratory (LANL) for the study of high-speed compressible flow and high-rate material deformation. PAGOSA is a three-dimensional Eulerian finite difference code, solving problems with a wide variety of equations of state (EOSs), material strength, and explosive modeling options. It has high efficiency for simulations running on massively parallel supercomputers. It is a multi-material code using volume of fluid (VOF) interface reconstruction and second order fully explicit time integration. Standard von Neumann artificial viscosity is used. Newly added material point method (MPM) plus Fluid-Implicit Particle (FLIP) capability can simulate high-speed metal fragmentation.
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Zhong, Mingjun, and Yuan Zhou. "A Multi-Fluid Model Coupled With Interface Tracking Method for Simulation of Liquid Jet Breakup." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82547.

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For liquid jet breakup, when small drops are fragmented from the surface of jet, the fluid’s interfaces with various length scales will coexist in the flow regimes. The paper presents a coupled method to simulate liquid jet breakup. The present method is based on Yan and Che’s strategy which has been proven to be capable for simulation of bubbly-slug flow. In the method, the basic multi-fluid model and interface tracking method are coupled by a unified solution frame work of MCBA-SIMPLE algorithm. The jet phase and continuous liquid phase are combined into a continuous phase in order that the large-scale interface of jet can be reconstructed by VOF/PLIC method. The coupled model consists two sub-models, the model based on VOF method and the conventional multi-fluid model; The relationships and switching of the sub-models are disused and summarized in the paper. Some cases are presented to show the capabilities of the current method. Firstly, the sub-model which is equivalent to the VOF method is used to simulate the interface behavior during the jet breakup and a breakup length equation is correlated. Then the coupled model is applied to the same simulation. A simple jet breakup model is used to simulate mass transfer of drops from jet. Variation of the drop surface area is considered by solving a transport equation. The simulation results preliminarily show that the current method is capable to simulate the complex jet breakup process. The main characteristics of the process such as breakup length and drops distribution are reasonably simulated.
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Kakimpa, B., H. P. Morvan, and S. Hibberd. "The Numerical Simulation of Multi-Scale Oil Films Using Coupled VOF and Eulerian Thin-Film Models." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56747.

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This paper presents a coupled ETFM-VOF framework for the numerical simulation of multi-scale thin liquid films. A depth-averaged Eulerian thin-film model (ETFM) is used to simulate the oil flow in very thin-film regions where film thicknesses are below the grid resolution while elsewhere in the domain where grid resolution is sufficient to resolve the film, a traditional Volume-of-Fluid (VOF) approach is retained. The two approaches are coupled through momentum and mass conserving source terms and a transition criterion is introduced where the total liquid volume fraction in each cell is evaluated and either the ETFM or VOF approach used depending on the sufficiency of the local grid resolution. Using this approach, thin-film flows characterised by multiple film thickness scales may be reliably simulated at a relatively lower computational cost. The model builds upon currently available ETFM and VOF approaches to thin-film modelling and represents a novel approach to the numerical simulation of multiphase flows involving a varying range of film thickness scales in space and time. A numerical test case of the 3D rimming flow inside an idealised aero-engine bearing chamber has been used to demonstrate the approach and comparisons made against high resolution VOF solutions.
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Das, Kaushik, Ron Janetzke, Debashis Basu, Steve Green, and John Stamatakos. "Numerical Simulations of Tsunami Wave Generation by Submarine and Aerial Landslides Using RANS and SPH Models." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79596.

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Tsunami wave generation by submarine and aerial landslides is examined in this paper. Two different two-dimensional numerical methods have been used to simulate the time histories of fluid motion, free surface deformation, shoreline movement, and wave runup from tsunami waves generated by aerial and submarine landslides. The first approach is based on the Navier-Stokes equation and the volume of fluid (VOF) method: the Reynolds Averaged Navier-Stokes (RANS)-based turbulence model simulates turbulence, and the VOF method tracks the free surface locations. The second method uses Smoothed Particle Hydrodynamics (SPH)—a numerical model based on a fully Lagrangian approach. In the current work, two-dimensional numerical simulations are carried out for a freely falling wedge representing the landslide and subsequent wave generations. Numerical simulations for the landslide-driven tsunami waves have been performed with different values of landslide material densities. Numerical results obtained from both approaches are compared with experimental data. Simulated results for both aerial and submerged landslides show the complex flow patterns in terms of the velocity field, shoreline evolution, and free-surface profiles. Flows are found to be strongly transient, rotational, and turbulent. Predicted numerical results for time histories of free-surface fluctuations and the runup/rundown at various locations are in good agreement with the available experimental data. The similarity and discrepancy between the solutions obtained by the two approaches are explored and discussed.
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Le, Anh Dinh, and Biao Zhou. "3-D Volume of Fluid Model for Proton Exchange Membrane Fuel Cells With Phase Change Effects." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33056.

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In this study, a 3-D Volume of Fluid (VOF) model has been developed to simulate the liquid water formation and transport with phase-change effects in real-time operation of a Proton Exchange Membrane Fuel Cell (PEMFC). By applying mass-transfer process incorporated with interface tracking algorithm of VOF method, this model provides the numerical visualization of formation, deformation, and removal processes of liquid water in the channels and porous media of PEMFC. The simulation results indicate that liquid water can be formed in certain regions in both the channel and porous media. The water amounts due to condensation/evaporation are quantitatively determined by the phase change rate among other factors. This approach and its results show that a real-time operation of a PEMFC can be numerically simulated along with experimental visualization.
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Abbasi Baharanchi, Ahmadreza, Seckin Gokaltun, and Shahla Eshraghi. "A Numerical Approach for the Simulation of Internal Nozzle Flow in a Pressure Swirl Atomizer Using Different Turbulent Models and Towards an Effective Inlet Weber Number." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65627.

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VOF Multiphase model is used to simulate the flow inside a pressure-swirl-atomizer. The capability of the Reynolds Stress Model and variants of the K-ε and K-ω models in modeling of turbulence has been investigated in the commercial computational fluid dynamics (CFD) software FLUENT 6.3. The Implicit scheme available in the volume-of-fluid (VOF) model is used to calculate the interface representation between phases. The atomization characteristics have been investigated as well as the influence of the inlet swirl strength of the internal flow. The numerical results have been successfully validated against experimental data available for the computed parameters. The performance of the RNG K-ε model was found to be satisfactory in reducing the computational cost and introducing an effective Weber number for the flow simulated in this study.
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Foust, Thomas D., Kurt D. Hamman, and Brent A. Detering. "Numerical Simulation of Black Liquor Spray Characteristics." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32058.

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The performance and capacity of Kraft recovery boilers is sensitive to black liquor velocity, droplet size and flow distribution in the furnace. Studies have shown that controlling droplet size and flow distribution improves boiler efficiency while allowing increased flight drying and devolatilization, and decreased carryover. The purpose of this study is to develop a robust two-phase numerical model to predict black liquor splashplate nozzle spray characteristics. A three-dimensional time dependent numerical study of black liquor sheet formation and sheet breakup is described. The volume of fluid (VOF) model is used to simulate flow through the splashplate nozzle up to initial sheet breakup and droplet formation. The VOF model solves the conservation equations of volume fraction and momentum utilizing the finite volume technique. Black liquor velocity, droplet size and flow distribution over a range of operating parameters are simulated using scaled physical models of splashplate nozzles. The VOF model is compared to results from a flow visualization experiment and experimental data found in the literature. The details of the simulation and experimental results are presented.
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Do, Van-Cuong, Hong-Xiang Ren, and Van-Suong Nguyen. "Using Unity3D to simulate VHF sailor 3520." In 2017 3rd IEEE International Conference on Computer and Communications (ICCC). IEEE, 2017. http://dx.doi.org/10.1109/compcomm.2017.8323066.

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Lin, San-Yih, Ya-Hsien Chin, and Yi-Cheng Chen. "Pressure Correction Method for Simulating Solid-Fluid Mixture Flow." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-08004.

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A pressure correction method is developed to simulate fluid-particle interaction flows. In this Paper, the three-dimensional solid-fluid mixture flows are investigated. The pressure corrected method coupled with the direct-forcing immersed boundary (IB) and the volume of fluid (VOF) methods is used to simulate the mixture flows. A discrete element method (DEM) together with a multi-time-step algorithm is introduced into the pressure correction method to calculate the forces and torques between solid bodies and between solid bodies and walls. As a demonstration of the efficient and capabilities of the present method, four test cases are simulated. They include sedimentation of one spherical particle in an enclosure, collapse of six solid-cylinder layers, two-dimensional solid-fluid mixture flow, and three-dimensional solid-fluid mixture flow.
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Reports on the topic "VOF simulace"

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Liekhus, K. J., G. L. Gresham, E. S. Peterson, C. Rae, N. J. Hotz, and M. J. Connolly. Modeling VOC transport in simulated waste drums. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10193819.

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Liekhus, K. J., G. L. Gresham, C. Rae, and M. J. Connolly. VOC transport in vented drums containing simulated waste sludge. Office of Scientific and Technical Information (OSTI), February 1994. http://dx.doi.org/10.2172/10145853.

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Liekhus, K. J., G. L. Gresham, E. S. Peterson, C. Rae, N. J. Hotz, and M. J. Connolly. Modeling unsteady-state VOC transport in simulated waste drums. Revision 1. Office of Scientific and Technical Information (OSTI), January 1994. http://dx.doi.org/10.2172/10134398.

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