Education

Research Description

The Multiphase Research Group focuses on using multiscale approaches for nuclear reactor simulations, development of new spectral cascade transfer multiphase flow turbulence models, and direct numerical simulation of single and multiphase turbulent flows.

Publications

A Perspective on Data-Driven Coarse Grid Modeling for System Level Thermal Hydraulics

Iskhakov, A. S., Tai, C.-K., Bolotnov, I. A., & Dinh, N. T. (2022, September 10), NUCLEAR SCIENCE AND ENGINEERING, Vol. 9. https://doi.org/10.1080/00295639.2022.2107864

An adaptive knowledge-based data-driven approach for turbulence modeling using ensemble learning technique under complex flow configuration: 3D PWR sub-channel with DNS data

Zhu, Y., Dinh, N. T., Saini, N., & Bolotnov, I. A. (2022), NUCLEAR ENGINEERING AND DESIGN, 393. https://doi.org/10.1016/j.nucengdes.2022.111814

Complex bubble deformation and break-up dynamics studies using interface capturing approach (vol 3, pg 139, 2021)

Fan, Y., Fang, J., & Bolotnov, I. (2022, June), EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW, Vol. 4, pp. 191–191. https://doi.org/10.1007/s42757-021-0127-1

Development of machine learning framework for interface force closures based on bubble tracking data

Tai, C.-K., Evdokimov, I., Schlegel, F., Bolotnov, I. A., & Lucas, D. (2022), NUCLEAR ENGINEERING AND DESIGN, 399. https://doi.org/10.1016/j.nucengdes.2022.112032

Direct Numerical Simulation of Bubble Formation Through a Submerged "Flute" With Experimental Validation

Pillai, N., Sponsel, N. L., Stapelmann, K., & Bolotnov, I. A. (2022), JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 144(2). https://doi.org/10.1115/1.4052051

High-fidelity pool boiling simulations on multiple nucleation sites using interface capturing method

Fan, Y., Li, M., Pointer, W. D., & Bolotnov, I. A. (2022), NUCLEAR ENGINEERING AND DESIGN, 399. https://doi.org/10.1016/j.nucengdes.2022.112004

Plasma breakdown in bubbles passing between two pin electrodes

Pillai, N., Sponsel, N. L., Mast, J. T., Kushner, M. J., Bolotnov, I. A., & Stapelmann, K. (2022), JOURNAL OF PHYSICS D-APPLIED PHYSICS, 55(47). https://doi.org/10.1088/1361-6463/ac9538

Selected papers from the 2020 International Topical Meeting on Advances in Thermal Hydraulics (ATH'20) Foreword

Bolotnov, I., & Benhamadouche, S. (2022, August 3), NUCLEAR TECHNOLOGY, Vol. 208, pp. III-III. https://doi.org/10.1080/00295450.2022.2086385

Detailed Analysis of the Effects of Spacer Grid and Mixing Vanes on Turbulence in a PWR Subchannel Under DFFB Conditions Based on DNS Data

Saini, N., & Bolotnov, I. A. (2021, December 8), NUCLEAR TECHNOLOGY, Vol. 12. https://doi.org/10.1080/00295450.2021.1974279

Evaluation of Length Scales and Meshing Requirements for Resolving Two-Phase Flow Regime Transitions Using the Level Set Method

Zimmer, M. D., & Bolotnov, I. A. (2021), JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 143(6). https://doi.org/10.1115/1.4049934

View all publications via NC State Libraries

Grants

Pilot Study on Two-Phase Flow DNS Application to Heat Transfer Enhancement Pipe

Mitsubishi Heavy Industries, Ltd.(10/01/22 - 5/15/23)

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Pilot Study on Two-Phase Flow DNS Application to Heat Transfer Enhancement Pipe

Sponsor: Mitsubishi Heavy Industries, Ltd.

Start Date: 10/01/22

End Date: 5/15/23

Abstract

The project will apply state-of-the-art two-phase flow DNS techniques for advanced heat exchanger designs. New capabilities will be added as necessary, and advanced analysis techniques will be applied to support coarse-grid model development.

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PHASTA PID CONTROLLER

US Dept. of Energy (DOE)(11/01/22 - 3/07/23)

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PHASTA PID CONTROLLER

Sponsor: US Dept. of Energy (DOE)

Start Date: 11/01/22

End Date: 3/07/23

Abstract

The PHASTA code is a two-phase direct numerical simulation code that uses the level set method for interface capturing. NNL has begun to use a version of PHASTA to explore physics fundamental to two-phase flow and generate high-fidelity numerical data to formulate multiphase computational fluid dynamics (MCFD) models. PHASTA is an open-source code that is available on GitHub. The PID controller capability will be transferred to NNL along with support as part of this project.

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Two Phase Flow Modeling and Simulation – CNP Core Project 7

Consortium for Nuclear Power (CNP)(7/01/22 - 6/30/23)

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Two Phase Flow Modeling and Simulation – CNP Core Project 7

Sponsor: Consortium for Nuclear Power (CNP)

Start Date: 7/01/22

End Date: 6/30/23

Abstract

The proposed scope will focus on demonstrating the DNS capabilities for GE’s problem of interest. Specifically, complex geometries and two-phase flow behavior at various flow conditions can be studied. The following tasks can be planned for the first year of the project:

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ICS Heat Exchange Optimization, CNP Core Project 8

Consortium for Nuclear Power (CNP)(7/01/22 - 6/30/23)

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ICS Heat Exchange Optimization, CNP Core Project 8

Sponsor: Consortium for Nuclear Power (CNP)

Start Date: 7/01/22

End Date: 6/30/23

Abstract

The proposed scope will focus on demonstrating the DNS capabilities for GE’s problem of interest. Specifically, complex geometries and two-phase flow behavior at various flow conditions can be studied. The following tasks can be planned for the first year of the project: 1) Identify geometry of interest to the industry and flow conditions suitable for DNS level meshing in collaboration with the CNP member 2) Demonstrate the meshing capabilities for selected geometry 3) Perform single phase flow simulations and collect basic statistics (e.g. averaged flow profiles) 4) Demonstrate two-phase flow simulation capabilities in flow regime suitable to DNS in this geometry 5) Evaluate the traditional modeling approach knowledge gaps and demonstrate how those can be narrowed / filled using high resolution simulations 6) Demonstrate how DNS statistical analysis can support for industry scale simulations capabilities

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Biocatalyst Interactions with Gases (BIG) Collaboration

Novo Nordisk Foundation(9/01/22 - 8/31/27)

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Biocatalyst Interactions with Gases (BIG) Collaboration

Sponsor: Novo Nordisk Foundation

Start Date: 9/01/22

End Date: 8/31/27

Abstract

This fundamental research is motivated by three major global challenges that directly involve the transformation of gas molecules: carbon dioxide (CO2) capture for greenhouse gas mitigation, CO2 conversion to fuels and chemicals, and nitrogen (N2) gas conversion to biologically available ammonia to meet growing fertilizer demand. The research focuses on creating and investigating multi-functional interfaces that durably immobilize enzymes near their gaseous substrates while simultaneously delivering essential chemical and electrical reducing equivalents and removing reaction products to achieve maximum catalytic rates. Biocatalytic systems to be explored are: conversion of CO2 to bicarbonate catalyzed by carbonic anhydrase, reduction of CO2 to formate catalyzed by formate dehydrogenase, and reduction of N2 to ammonia catalyzed by nitrogenase. We envision that minimization of reaction barriers near immobilized biocatalyst interfaces involving gas molecule conversions will lead to transformative innovations that help overcome global sustainability challenges.

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High-performance computing studies of HFIR flow channel

Oak Ridge National Laboratories - UT-Battelle LLC(8/26/21 - 3/31/22)

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High-performance computing studies of HFIR flow channel

Sponsor: Oak Ridge National Laboratories - UT-Battelle LLC

Start Date: 8/26/21

End Date: 3/31/22

Abstract

High resolution computational fluid dynamics simulations of the HFIR reactor channel will be designed. Those simulations will demonstrate the practicality of the DNS or LES approach to understand the flow phenomenon of complex geometries of interest.

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Two-Phase Flow DNS Phase 2 Project

Mitsubishi Heavy Industries, Ltd.(5/01/21 - 10/31/22)

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Two-Phase Flow DNS Phase 2 Project

Sponsor: Mitsubishi Heavy Industries, Ltd.

Start Date: 5/01/21

End Date: 10/31/22

Abstract

The project will apply state-of-the-art two-phase flow DNS techniques for advanced heat exchanger designs. New capabilities will be added as necessary, and advanced analysis techniques will be applied to support coarse-grid model development.

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Plasma Breakdown and Instabilities in the Multiphase Plasma-Gas Bubble-Liquid System

National Science Foundation (NSF)(5/01/21 - 4/30/24)

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Plasma Breakdown and Instabilities in the Multiphase Plasma-Gas Bubble-Liquid System

Sponsor: National Science Foundation (NSF)

Start Date: 5/01/21

End Date: 4/30/24

Abstract

The goal of this research program is to gain fundamental understanding of the multi-phase plasma-gas-liquid system by utilizing both theoretical and experimental approaches. The plasma breakdown and streamer development in steep gradients will be investigated dependent on realistic bubble geometries and as a function of applied voltage conditions. The multiphase interface tracking DNS code PHASTA has been well-established through a wide variety of two-phase flow problems. When coupled with the well-established plasma modeling and characterization code nonPDPSIM, it will give new insights into gas bubble formation and how the size and shape of the bubbles will influence the breakdown of the plasma. The experiment will allow the production of various well-defined bubble shapes and sizes, making it possible to investigate the dependency of the plasma breakdown on bubble geometries. The project will provide 1) the initial steps to combine high-resolution multiphase physics with electric fields and plasma physics, opening the opportunity to study fundamental plasma physics in a multiphase system, and 2) the experimental investigations to benchmark the simulations and to study how the polarity of the applied voltage pulses affects the streamer propagation in a bubble in liquids.

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Multiple Bubble Boiling Simulation Scaling and Evaluation

US Dept. of Energy (DOE)(9/08/20 - 11/30/20)

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Multiple Bubble Boiling Simulation Scaling and Evaluation

Sponsor: US Dept. of Energy (DOE)

Start Date: 9/08/20

End Date: 11/30/20

Abstract

The proposed high resolution simulation efforts will evaluate the boiling capabilities in different pressure conditions and compare the results with existing models, experiments and previously published simulations. The work will evaluate the interface capturing approach capabilities for the problems of interest and will provide the recommendations about requirements and future research to expand those capabilities.

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Center for thermal-fluids application in nuclear energy: Establishing the knowledge base for thermal-hydraulic multiscale simulation to accelerate the deployment of advanced reactors.

US Dept. of Energy (DOE)(10/01/20 - 9/30/23)

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Center for thermal-fluids application in nuclear energy: Establishing the knowledge base for thermal-hydraulic multiscale simulation to accelerate the deployment of advanced reactors.

Sponsor: US Dept. of Energy (DOE)

Start Date: 10/01/20

End Date: 9/30/23

Abstract

In this DOE-funded project the NCSU team will support the larger effort in establishing the knowledgebase for thermal-hydraulic multiscale simulation to accelerate the deployment of advanced reactors. NCSU focus will be on performing high resolution simulations of advanced reactor flows as well as developing advanced methodologies for data processing using machine-learning techniques.

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