流体数学セミナー

第 16 回　流体数学セミナー

日　時: 2025 年 3 月 31日(月) 14時30分～ 15時30分, 15時45分　～ 16時45分
場所・教室:　お茶の水女子大学理学部1号館633教室
講演者:　Prof. Mohammad Ferdows　 (University of Dhaka)
講演題目:　Thermofluid energy dissipative particle convective phenomena in Hybrid system
講演要旨: Motivated by materials processing and hybrid fuel cell applications, in the current paper a numerical energy Dissipative Particle Dynamics (eDPD) method is deployed to simulate natural convection heat transfer in a differentially heated enclosure filled with different hybrid nanofluids separately: Ag(50%)-ZnO(50%) + H₂O, TiO₂(50%) -SiO₂(50%) + H₂O(50%) -EG(50%), and SiC(50%) -CuO(50%) /C nanocomposite(50%) + EG. Validation with previous experimental and numerical (finite volume method) studies from the literature is included. Deep feedforward neural networks (DFNNs) are additionally deployed to optimize Nusselt number (dimensionless wall heat transfer rate) values for hybrid nanoparticle concentrations. This study shows that using both eDPD simulations and machine learning can help improve and predict more effectively transport characteristics of hybrid nanofluids in enclosure flows of relevance to materials processing and fuel cell systems.

日　時: 2025 年 4月1日(火) 14時30分～ 15時30分,15時45分～ 16時45分
場所・教室:　お茶の水女子大学理学部1号館633教室
講演者:　Prof. Mohammad Ferdows　 (University of Dhaka)
講演題目:　Instabilities of Convective flow and heat transfer with flow physics
講演要旨: We shall begin to examine the stability properties of convection with Darcy-Rayleigh parameter and also the steady convection layer flow about a horizontal/vertical surface generated by Newtonian heating and others will be considered. The governing boundary layer equations are first transformed into a system of non-dimensional equations via non-dimensional variables, and then into similar equations. Numerical solutions will obtain for flow stability, profiles and physical properties for various values of problem physical parameters. .

日　時: 2025 年 4月 2日(水) 14時30分～ 15時30分,15時45分～ 16時45分
場所・教室:　お茶の水女子大学理学部1号館633教室
講演者:　Prof. Mohammad Ferdows　 (University of Dhaka)
講演題目:　Biomegnetic flow through nano and ferro fluidic particles embedded by magnetic environment
講演要旨:A mathematical and computational analysis has been put forward that dealt with, in particular, the flow of a heated Ferro-fluid over a sheet under the action of a magnetic field generated by a magnetic dipole. We will be consistent with the principles of Ferrohydrodynamics (FHD) and Magnetohydrodynamics (MHD). This study is hoped to be helpful for more accurate understanding of blood flow in human body suffering from arterial or vascular diseases.
On the other hand, we will examine the effects of uniform and non-uniform magnetic fields on suspensions of bio-magnetic fluid and nano-bio-magnetic fluid under hyperthermia. By manipulating the nature of the magnetic field, it is possible to raise or decrease the temperature in the flow domain of magnetic nano-fluids using COMSOL multi-physics.

日　時: 2025 年 5 月 9日(金) 15時30分～ 17時
場所・教室:　お茶の水女子大学理学部1号館633教室
講演者:　中里亮介氏(信州大学)
講演題目:　Analyticity and its application to the solution of compressible Navier-Stokes-Korteweg equations with zero sound speed in scaling critical framewor
講演要旨: We consider the initial-value problem for the compressible Navier-Stokes-Korteweg equations in the d-dimensional Euclidean space R^d (d≧3).The system is well-known as the Diffuse Interface model describing the motion of a vaper-liquid mixture in a compressible viscous fluid. In this talk, we would like to handle the analyticity and time-decay estimates of the global-in-time solution around the constant equilibrium states (ρ_*,0) (ρ_*>0) of the problem under the zero sound speed case (namely, P'(ρ_*)=0, where P=P(ρ) stands for the pressure) and scaling critical settings based on Fourier-Herz spaces. If time allows, we would introduce the result on the decay estimate of the first order asymptotic formula.This talk is based on the joint work with Prof. Takayuki Kobayashi (Osaka University).

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