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Motohiko Nohmi
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Journal Articles

Machine-Learning-Based Reconstruction of Turbulent Vortices From Sparse Pressure Sensors in a Pump Sump

Kai Fukami, Byungjin An, Motohiko Nohmi, Masashi Obuchi, Kunihiko Taira
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. December 2022, 144(12): 121501.
Paper No: FE-22-1251
https://doi.org/10.1115/1.4055178
Published Online: August 23, 2022
View Article titled, Machine-Learning-Based Reconstruction of Turbulent Vortices From Sparse Pressure Sensors in a Pump Sump
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Topics: Artificial neural networks, Flow (Dynamics), Machine learning, Machinery, Multilayer perceptron, Pressure sensors, Pumps, Sensors, Turbulence, Vortices
Journal Articles

Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing

Qiong Liu, Byungjin An, Motohiko Nohmi, Masashi Obuchi, Kunihiko Taira
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. August 2020, 142(8): 081202.
Paper No: FE-19-1906
https://doi.org/10.1115/1.4046692
Published Online: April 1, 2020
View Article titled, Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing
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Topics: Flow (Dynamics), Flow control, Pressure, Pumps, Vortices, Vortex flow
Proceedings Papers

Numerical Investigation on the Effect of Blade Loading on Unsteady Sheet Cavitation Patterns

Jeremy Nahon, Mehrdad Zangeneh, Motohiko Nohmi, Hiroyoshi Watanabe
Proc. ASME. AJKFluids2019, Volume 5: Multiphase Flow, V005T05A016, July 28–August 1, 2019
Paper No: AJKFluids2019-5399
https://doi.org/10.1115/AJKFluids2019-5399
View Paper titled, Numerical Investigation on the Effect of Blade Loading on Unsteady Sheet Cavitation Patterns
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Topics: Blades, Cascades (Fluid dynamics), Cavitation, Simulation
Proceedings Papers

Global Stability Analysis on the Spiral-Vortex Mode in the Confined Cavity Flow Between Rotating and Stationary Disks

Kie Okabayashi, Yuki Kodera, Shintaro Takeuchi, Takeo Kajishima, Byungjin An, Motohiko Nohmi, Masashi Obuchi
Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A066, July 28–August 1, 2019
Paper No: AJKFluids2019-4785
https://doi.org/10.1115/AJKFluids2019-4785
View Paper titled, Global Stability Analysis on the Spiral-Vortex Mode in the Confined Cavity Flow Between Rotating and Stationary Disks
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Topics: Cavity flows, Disks, Stability, Vortices, Eigenvalues, Flow (Dynamics), Reynolds number, Rotors, Stators, Viscous flow
Proceedings Papers

Numerical Analysis of Contraction Geometry Effects on Cavitation Choking in a Piping System

Motohiko Nohmi, Shusaku Kagawa, Tomoki Tsuneda, Wakana Tsuru, Kazuhiko Yokota
Proc. ASME. AJKFluids2019, Volume 3B: Fluid Applications and Systems, V03BT03A033, July 28–August 1, 2019
Paper No: AJKFluids2019-5359
https://doi.org/10.1115/AJKFluids2019-5359
View Paper titled, Numerical Analysis of Contraction Geometry Effects on Cavitation Choking in a Piping System
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Topics: Cavitation, Geometry, Numerical analysis, Piping systems, Flow (Dynamics), Valves, Pipes, Centrifugal force, Computational fluid dynamics, Fluids
eBook Chapter

Cavitation CFD Prediction for NACA0015 Hydrofoil Flow Considering Boundary Layer Characteristics

Series: ASME Press Select Proceedings
Publisher: ASME Press
Published: 2018
ISBN: 9780791861851
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Topics: Boundary layers, Cavitation, Computational fluid dynamics, Flow (Dynamics), Hydrofoil
eBook Chapter

Comparative Assessment of a Barotropic Model and a Void Fraction Transport Model for Numerically Predicting Steady Sheet Cavitation

Series: ASME Press Select Proceedings
Publisher: ASME Press
Published: 2018
ISBN: 9780791861851
Open the PDF for Comparative Assessment of a Barotropic Model and a Void Fraction Transport Model for Numerically Predicting Steady Sheet Cavitation in another window
Topics: Cavitation, Porosity
Proceedings Papers

Clogging Mechanisms of Vortex Pumps: Fibrous Material Motion Capture and Simulation With a CFD and DEM Coupling Method

Yamato Imasaka, Hitoshi Kanno, Sumio Saito, Kazuyoshi Miyagawa, Motohiko Nohmi, Miho Isono, Masahito Kawai
Proc. ASME. FEDSM2018, Volume 3: Fluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics, V003T12A030, July 15–20, 2018
Paper No: FEDSM2018-83503
https://doi.org/10.1115/FEDSM2018-83503
View Paper titled, Clogging Mechanisms of Vortex Pumps: Fibrous Material Motion Capture and Simulation With a CFD and DEM Coupling Method
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Topics: Computational fluid dynamics, Discrete element methods, Pumps, Simulation, Vortices, Particulate matter, String, Rods, Computation, Sewage
Proceedings Papers

Numerical Study of One Dimensional Pipe Flow Under Pump Cavitation Surge

Motohiko Nohmi, Satoshi Yamazaki, Shusaku Kagawa, Byungjin An, Donghyuk Kang, Kazuhiko Yokota
Proc. ASME. FEDSM2017, Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery, V01AT05A023, July 30–August 3, 2017
Paper No: FEDSM2017-69427
https://doi.org/10.1115/FEDSM2017-69427
View Paper titled, Numerical Study of One Dimensional Pipe Flow Under Pump Cavitation Surge
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Topics: Cavitation, Pipe flow, Pumps, Surges, Pipes, Distributed parameter systems, Lumped parameter models, Equations of motion, Flow (Dynamics), Piping systems
Proceedings Papers

An Approximation Method for the Cavitation Eroded Surface

Motohiko Nohmi
Proc. ASME. FEDSM2013, Volume 2, Fora: Cavitation and Multiphase Flow; Fluid Measurements and Instrumentation; Microfluidics; Multiphase Flows: Work in Progress, V002T06A009, July 7–11, 2013
Paper No: FEDSM2013-16506
https://doi.org/10.1115/FEDSM2013-16506
View Paper titled, An Approximation Method for the Cavitation Eroded Surface
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Topics: Approximation, Cavitation, Cavitation erosion, Flow (Dynamics), Geometry, Boundary-value problems, Computational fluid dynamics, Computers, Solid models
Journal Articles

Study of Quantitative Numerical Prediction of Cavitation Erosion in Cavitating Flow

Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiaki Ikohagi
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. January 2013, 135(1): 011302.
Paper No: FE-12-1139
https://doi.org/10.1115/1.4023072
Published Online: December 21, 2012
View Article titled, Study of Quantitative Numerical Prediction of Cavitation Erosion in Cavitating Flow
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Topics: Bubbles, Cavitation erosion, Collapse, Erosion, Flow (Dynamics), Pressure, Numerical analysis, Surfaces (Materials)
Proceedings Papers

On Boundary Conditions for Cavitation CFD and System Dynamics of Closed Loop Channel

Motohiko Nohmi, Toshiaki Ikohagi, Yuka Iga
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora, 183-190, July 24–29, 2011
Paper No: AJK2011-33007
https://doi.org/10.1115/AJK2011-33007
View Paper titled, On Boundary Conditions for Cavitation CFD and System Dynamics of Closed Loop Channel
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Topics: Boundary-value problems, Cavitation, Computational fluid dynamics, System dynamics, Flow (Dynamics), Pressure, Closed loop systems, Computer software, Dynamics (Mechanics), Lumped parameter models
Proceedings Papers

A Detailed Observation of Hydrofoil Cavitation and a Proposal for Improving Cavitation Model

Motohiko Nohmi, Naoya Ochiai, Yuka Iga, Toshiaki Ikohagi
Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora, 19-27, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-30435
https://doi.org/10.1115/FEDSM-ICNMM2010-30435
View Paper titled, A Detailed Observation of Hydrofoil Cavitation and a Proposal for Improving Cavitation Model
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Topics: Cavitation, Hydrofoil, Bubbles, Cavities, Blades, Boiling, Collapse, Computational fluid dynamics, Dynamics (Mechanics), Erosion
Proceedings Papers

Numerical Prediction Method of Cavitation Erosion

Motohiko Nohmi, Toshiaki Ikohagi, Yuka Iga
Proc. ASME. FEDSM2008, Volume 1: Symposia, Parts A and B, 1139-1145, August 10–14, 2008
Paper No: FEDSM2008-55126
https://doi.org/10.1115/FEDSM2008-55126
View Paper titled, Numerical Prediction Method of Cavitation Erosion
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Topics: Bubbles, Cavitation, Cavitation erosion, Cavities, Collapse, Computation, Computational fluid dynamics, Dynamics (Mechanics), Erosion, Flow (Dynamics)
Proceedings Papers

Experimental and Numerical Study of Cavitation Breakdown in a Centrifugal Pump

Motohiko Nohmi, Akira Goto, Yuka Iga, Toshiaki Ikohagi
Proc. ASME. FEDSM2003, Volume 1: Fora, Parts A, B, C, and D, 1251-1258, July 6–10, 2003
Paper No: FEDSM2003-45409
https://doi.org/10.1115/FEDSM2003-45409
View Paper titled, Experimental and Numerical Study of Cavitation Breakdown in a Centrifugal Pump
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Topics: Cavitation, Centrifugal pumps, Flow (Dynamics), Pressure, Bubbles, Computational fluid dynamics, Blades, Cavities, Impellers, Suction
Journal Articles

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

Yuka Iga, Assistant Researcher, Motohiko Nohmi, Senior Researcher, Akira Goto, Director, Byeong Rog Shin, Associate Professor, Toshiaki Ikohagi, Professor
Journal: Journal of Fluids Engineering
Article Type: Technical Papers
J. Fluids Eng. July 2003, 125(4): 643–651.
https://doi.org/10.1115/1.1596239
Published Online: August 27, 2003
View Article titled, Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil
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Topics: Cascades (Fluid dynamics), Cavitation, Cavities, Hydrofoil, Pressure, Cavity flows, Numerical analysis, Flow (Dynamics), Surface waves (Fluid)
Journal Articles

Hydrodynamic Design System for Pumps Based on 3-D CAD, CFD, and Inverse Design Method

Akira Goto, Motohiko Nohmi, Takaki Sakurai, Yoshiyasu Sogawa
Journal: Journal of Fluids Engineering
Article Type: Technical Papers
J. Fluids Eng. June 2002, 124(2): 329–335.
https://doi.org/10.1115/1.1471362
Published Online: May 28, 2002
View Article titled, Hydrodynamic Design System for Pumps Based on 3-D CAD, CFD, and Inverse Design Method
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Topics: Blades, Computational fluid dynamics, Design, Flow (Dynamics), Pumps, Design methodology, Diffusers, Impellers