A5074773861- Wind and Air Flow Studies
- Infection Control and Ventilation
- Aerodynamics and Acoustics in Jet Flows
- Offshore Engineering and Technologies
- Aerodynamics and Fluid Dynamics Research
- Building Energy and Comfort Optimization
- Fluid Dynamics and Turbulent Flows
- Oil and Gas Production Techniques
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Vibration Analysis
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Heat Transfer Mechanisms
- Spacecraft and Cryogenic Technologies
- Heat Transfer and Optimization
- Geotechnical Engineering and Underground Structures
- Conservation Techniques and Studies
- Refrigeration and Air Conditioning Technologies
- Structural Integrity and Reliability Analysis
- Model Reduction and Neural Networks
- Fire dynamics and safety research
Peter the Great St. Petersburg Polytechnic University
2016-2023
This paper presents and discusses the results of “2022 International Computational Fluid Dynamics Challenge on violent expiratory events” aimed at assessing ability different computational codes turbulence models to reproduce flow generated by a rapid prototypical exhalation dispersion aerosol cloud it produces. Given common configuration, total 7 research teams from countries have performed 11 numerical simulations solving Unsteady Reynolds Averaged Navier–Stokes (URANS) or using Large-Eddy...
The objective of the paper is to demonstrate importance unsteady Computational Fluid Dynamics (CFD) simulations and long-term measurements for reliable assessment thermal comfort indoors, proper categorization indoor environment identifying reasons complaints due draught discomfort. Numerical experimental were applied in combination study ventilation a field laboratory, university classroom with controlled environment. Strong unsteadiness airflow was registered both RANS results real-scale...
The goal of the study is to validate Large Eddy Simulation (LES) data on mixing ventilation in an isothermal room at conditions benchmark experiments by Hurnik et al. (2015). focus accuracy mean and rms velocity fields prediction quasi-free jet zone with 3D supplied from a sidewall rectangular diffuser. Calculations were carried out using ANSYS Fluent 16.2 software algebraic wall-modeled LES subgrid-scale model. CFD results vector are compared Laser Doppler Anemometry data. difference...
The contribution deals with a model of passive heat exchanger based on the buoyancy effects aimed at subsea processing natural gas produced. 3D unsteady external buoyancy-induced seawater flow through staggered tube bundle Gr = 3 × 105 was simulated using full Navier-Stokes equations no turbulence in combination RANS modelling internal Re 8×105 and simulation conduction steel pipe wall. Evolution temperature fields as well variations output from row to are predicted. It found that conjugate...
The goal of the study is validation Wall-Modeled Large Eddy Simulation (WMLES) ventilation in an isothermal room at conditions experiments by Nielsen et al. Two values inlet slot width were considered. Calculations carried out using ANSYS Fluent 16.2 software with algebraic WMLES subgrid-scale model. uniform computational meshes up to 58 million cells used. focus results discussion on accuracy mean and rms velocity fields prediction both jet zone low-velocity occupied zone. It concluded that...
The paper presents and discusses data for the ventilation airflow in an isothermal room corresponding to Nielsen et al. (1978) test computed with Large Eddy Simulation (LES) Reynolds-Averaged Navier-Stokes (RANS) approaches. As LES computations provide directly both speed velocity components data, difference between mean values is discussed. For RANS that give only, application of velocity-to-speed conversion procedure based on turbulence kinetic energy field provided by a model resulted...
The goal of the study is to evaluate thermohydraulic characteristics a passive buoyancy-dominated heat exchanger aimed at subsea processing natural gas produced. 3D unsteady buoyancy-induced water flow through staggered tube bank Grashof number 3 × 105 simulated using full Navier-Stokes equations with no turbulence model. Direct numerical simulation external draft combined simultaneous Reynolds-averaged modeling internal in plain serpentine pipes Re = 8 and conduction massive steel pipe...
The paper presents Large Eddy Simulation (LES) data for the ventilation airflow in an isothermal room corresponding to Nielsen et al. (1978) test. Based on a simplified formulation with periodicity boundary conditions transverse direction, detailed grid sensitivity study was performed. Using LES velocity components and mean speed extracted from periodic domain-size-independent solution, assesses velocity-to-speed conversion procedures available literature Reynolds-Averaged Navier-Stokes processing.
Abstract This paper presents the results of RANS-based numerical simulation 3D flow dynamics and heat transfer in turbulent free-convection boundary layer disturbed by a transverse periodic row finite-height cylindrical obstacles. The disturbing elements are mounted on vertical isothermally heated plate along which develops starting from 2D state prescribed at computational domain inlet. height-to-diameter ratio obstacles is varied 1 to 3, their surface treated as adiabatic or isothermal....
The results of numerical simulation the formation and motion turbulent puffs resulting from blowing pulsed jets with different initial velocities durations are presented. A model an axisymmetric flow described by non-stationary Reynolds equations is adopted. It shown that, regardless conditions, after same dimensionless time interval instant jet outflow begins, a vortex cloud appears, which has spherical shape vortex. vortex-induced in rest space close to potential. been established that...
The current contribution presents the results of numerical simulation airflow and heat transfer in a model room rectangular shape ventilated with single plane jet under conditions experiment by Mataoui et al. (2001). 2D 3D unsteady Reynolds-averaged Navier-Stokes approaches were used. Numerical solutions obtained CFD package ANSYS Fluent based on finite volume method cell-centered variable arrangement. position air supply nozzle corresponds to self-oscillatory experimental conditions....
The current contribution presents the results of calculations a pulsed jet formation during single cough based on recent test by Fabregat et al. (2021) where DNS an idealized isolated was performed. Two approaches for turbulence modeling were applied – Large Eddy Simulation (LES) and Unsteady Reynolds-Averaged Navier-Stokes (URANS). particles propagation described with Lagrangian formulation, both without interaction continuous phase. changes in airflow structure are analyzed discussed,...
The study is devoted to the Unsteady Reynolds-Averaged Navies-Stokes (URANS) simulation of ventilation in an isothermal room with numerous jets supplied from ceiling diffusers. computations airflow under test conditions considered were carried out classroom Technical University Sofia no occupants. floor has a simple rectangular form, but several columns, beams, window sills, and four radiators are located inside that makes geometry more complex. Air through fan coils, Reynolds number 2×104....
Abstract The paper presents the numerical study of 3D unsteady buoyancy-induced water flow through a staggered tube bank typical for subsea cooling units used at seabed gas compression modules. For Grashof number from range 10 5 …10 6 parametric computations have been performed using direct simulation draft in inter-tube space. various arrangement bounding walls, effect side on heat transfer is analyzed and discussed.
Abstract The paper presents the numerical study of 3D flow and neutrally buoyant pollutant transport in a model atrium under conditions test experiment by Thatcher et al. (2004) with controlled uranine dye spill. For Reynolds number 2160 Reynolds-Averaged Navier-Stokes approach was applied. Analysis CFD predictability for steady-state fully-developed regime transient process done comparison experimental data on contaminant concentration fields. various positions source ventilation...
Abstract The main goal of the study is to evaluate effect thermal manikin shape on uncertainty comfort parameters CFD prediction. Numerical simulation airflow and heat transfer was carried out in a model room with displacement ventilation where standing heated located (test by P.V. Nielsen et al.). modelling using three shapes: detailed one (close human body shape), simplified (block) one, single-parallelepiped shape. 3D calculations were ANSYS Fluent package. Turbulence performed...
Abstract The contribution presents the results of numerical simulation 3D turbulent airflow and heat transfer around a seated thermal manikin in model room with mixing ventilation. main goal study is to evaluate uncertainties caused by CFD model. detailed geometry correspond experiment P.V. Nielsen et al. (2007). computational based on RANS approach standard k - ε turbulence applied. radiation effects are taken into account surface-to-surface considers (1) effect supply air flow rate...
The contribution deals with a model of passive buoyancy-dominated heat exchanger aimed at subsea processing natural produced. 3D unsteady buoyancy-induced water flow through staggered tube bank the Grashof number 3×105 is simulated using full Navier-Stokes equations no turbulence model. Direct numerical simulation external draft combined simultaneous RANS modelling internal in plain serpentine pipes Re = 8×105 and conduction massive steel pipe wall. paper compares transfer characteristics...
The contribution deals with a model of passive buoyancy-dominated heat exchanger aimed at subsea processing natural produced. 3D unsteady buoyancy-induced water flow through staggered tube bank the Grashof number 3×105 is simulated using full Navier-Stokes equations no turbulence model. Direct numerical simulation external draft combined simultaneous RANS modelling internal in plain serpentine pipes Re = 8×105 and conduction massive steel pipe wall. paper compares transfer characteristics...