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Air-Water Interaction

The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform

Fotis Sotiropoulos – 1st expert on this subject based on the ideXlab platform

  • level set immersed boundary method for coupled simulation of air water Interaction with complex floating structures
    Journal of Computational Physics, 2014
    Co-Authors: Antoni Calderer, Seokkoo Kang, Fotis Sotiropoulos

    Abstract:

    We propose a new computational approach for simulating the coupled Interaction between Air-Water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid-structure Interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) 21 with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two- and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.

  • Level set immersed boundary method for coupled simulation of air/water Interaction with complex floating structures
    Journal of Computational Physics, 2014
    Co-Authors: Antoni Calderer, Seokkoo Kang, Fotis Sotiropoulos

    Abstract:

    We propose a new computational approach for simulating the coupled Interaction between Air-Water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid-structure Interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) 21 with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two- and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.

Antoni Calderer – 2nd expert on this subject based on the ideXlab platform

  • level set immersed boundary method for coupled simulation of air water Interaction with complex floating structures
    Journal of Computational Physics, 2014
    Co-Authors: Antoni Calderer, Seokkoo Kang, Fotis Sotiropoulos

    Abstract:

    We propose a new computational approach for simulating the coupled Interaction between Air-Water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid-structure Interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) 21 with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two- and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.

  • Level set immersed boundary method for coupled simulation of air/water Interaction with complex floating structures
    Journal of Computational Physics, 2014
    Co-Authors: Antoni Calderer, Seokkoo Kang, Fotis Sotiropoulos

    Abstract:

    We propose a new computational approach for simulating the coupled Interaction between Air-Water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid-structure Interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) 21 with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two- and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.

Y. Choi – 3rd expert on this subject based on the ideXlab platform

  • Influence of Design Parameters on the Air/Liquid Ratio of an Air Induction Nozzle
    Journal of Mechanics, 2017
    Co-Authors: F. Vashahi, S. Ra, Y. Choi

    Abstract:

    AbstractA two-phase flow parametric study on an air induction nozzle with water and air as the working fluids is presented. Liquid was supplied at the pre-orifice with various inlet pressures ranging from 3 to 6 bar. The Interaction between air and water at the molecular level at the orifice exit leads to formation of a strong shear layer that is intensified with the increase in inlet pressure. Thus, it is vital to regulate the ratio of the intake air to the supplied liquid so that the generated micro bubbles fit the design criteria. CFD analysis was conducted using the commercial software STAR CCM+ from Siemens and validated against experimental data to investigate the design parameters and their effect on the ALR. A volume of fluid (VOF) method of the RANS models was used to undertake the Air-Water Interaction. Parameters such as the throat, air orifice, and air inlet diameter, along with the diffuser angle, were investigated. It was found that certain parameters such as the throat diameter have a more significant effect on the air/liquid entrainment ratio than other parameters.

  • An experimental and CFD analysis of a two-phase flow air induction nozzle with agricultural application
    2016 6th International Conference on Simulation and Modeling Methodologies Technologies and Applications (SIMULTECH), 2016
    Co-Authors: F. Vashahi, S. Ra, Y. Choi

    Abstract:

    The two phase flow parametric study on the air induction nozzle is presented with water and air as working fluid where liquid was supplied at the pre-orifice with various inlet pressures ranged from 3 to 6 bar. The Interaction between air and water at molecular level at the orifice exit leads to forming a strong shear layer intensified with increase in inlet pressure. Mean diameter and void fraction in each bubble and their individual shapes is adjusted prior to the desired criteria. Thus, it is vital to regulate the ratio of intake air to the supplied liquid so that the generated micro bubbles fit the design criteria. CFD analysis was accompanied via commercial software STAR CCM+ from cd-adapco and validated against experimental data to find the most appropriate turbulence model. Then, the chosen model is used to investigate design parameters and their effect on the desired parameters. A volume of fluid (VOF) method of RANS models used to undertake the Air-Water Interaction. Results of such comparison revealed minor priority of the Realizable k-ε to the k-ω model. In addition, the unsteady state solution presented remarkable predictions in compare to that of steady state solution in particular predicting air behaviour.

  • SIMULTECH – An experimental and CFD analysis of a two-phase flow air induction nozzle with agricultural application
    Proceedings of the 6th International Conference on Simulation and Modeling Methodologies Technologies and Applications, 2016
    Co-Authors: F. Vashahi, S. Ra, Y. Choi

    Abstract:

    The two phase flow parametric study on the air induction nozzle is presented with water and air as working fluid where liquid was supplied at the pre-orifice with various inlet pressures ranged from 3 to 6 bar. The Interaction between air and water at molecular level at the orifice exit leads to forming a strong shear layer intensified with increase in inlet pressure. Mean diameter and void fraction in each bubble and their individual shapes is adjusted prior to the desired criteria. Thus, it is vital to regulate the ratio of intake air to the supplied liquid so that the generated micro bubbles fit the design criteria. CFD analysis was accompanied via commercial software STAR CCM+ from cd-adapco and validated against experimental data to find the most appropriate turbulence model. Then, the chosen model is used to investigate design parameters and their effect on the desired parameters. A volume of fluid (VOF) method of RANS models used to undertake the Air-Water Interaction. Results of such comparison revealed minor priority of the Realizable k-e to the k-ω model. In addition, the unsteady state solution presented remarkable predictions in compare to that of steady state solution in particular predicting air behaviour.