CFD In-Cylinder Flow Simulation of an Engine and Flow Visualization

1995 ◽  
Author(s):  
Hisato Hori ◽  
Tadao Ogawa ◽  
Toshihiko Kuriyama
Keyword(s):  
Flow Visualization ◽  
Flow Simulation ◽  
Cylinder Flow

Investigation of diesel engine in cylinder flow phenomena using CFD cold flow simulation

2019 ◽  
pp. 329-336
Author(s):  
A.K. Azad ◽  
Pobitra Halder ◽  
K. Nanthagopal ◽  
B. Ashok
Keyword(s):  
Diesel Engine ◽  
Flow Simulation ◽  
Cold Flow ◽  
Flow Phenomena ◽  
Cylinder Flow

Effect of Valve Opening/Closing Setup on CFD Prediction of Engine Flows

2015 ◽  
Author(s):  
Xiaofeng Yang ◽  
Seunghwan Keum ◽  
Tang-wei Kuo
Keyword(s):  
Internal Combustion Engines ◽  
Best Practice ◽  
Flow Simulation ◽  
Grid Resolution ◽  
Valve Lift ◽  
Navier Stokes ◽  
Solid Boundary ◽  
Piv Measurement ◽  
Parametric Studies ◽  
Cylinder Flow

In Computational Fluid Dynamics (CFD) simulations of internal combustion engines, one of the critical modeling parameters is the valve setup. A standard workaround is to keep the valve opens at a certain clearance (minimum valve lift), while imposing a solid boundary to mimic valve closure. This method would yield a step change in valve lift during opening and closing event, and different valve event timing than hardware. Two parametric studies were performed to examine a) the effect of the minimum valve lift and b) the effect of grid resolution at the minimum valve lift on predicted in-cylinder flow fields in Reynolds Averaged Navier-Stokes (RANS) simulations. The simulation results were compared with the state-of-art PIV measurement from a two-valve transparent combustion chamber (TCC-3) engine. The comparisons revealed that the accuracy of flow simulation are sensitive to the choice of minimum valve lift and grid resolution in the valve seat region. In particular, the predicted in-cylinder flow field during the intake process was found to be very sensitive to the valve setup. A best practice CFD valve setup strategy is proposed as a result of this parametric studies. The proposed CFD valve setup was applied to Large Eddy Simulation (LES) of TCC-3 engine and preliminary results showed noticeable improvement already. Further evaluation of the valve setup strategy for LES simulations is on-going and will be reported in a separate report.

scholarly journals Investigation on computed pressures from PIV, a study of how boundary definitions affect pressure accuracy along objects on the example of a cylinder flow.

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Francisco Felis-Carrasco ◽  
David Hess ◽  
Bo Beltoft Watz ◽  
Miguel Alfonso Mendez
Keyword(s):  
Poisson Equation ◽  
Cfd Simulation ◽  
Flow Simulation ◽  
Test Case ◽  
Whole Process ◽  
Piv Measurement ◽  
Flow Past A Cylinder ◽  
Coupling Approach ◽  
Cylinder Flow ◽  
The Impact

This work discusses an approach to compute pressure fields from planar PIV measurement using standard CFD tools. In particular, we propose a combination of interpolation and mesh adaptation to import the PIV measurements on a grid that is morphed around objects, and is fine enough to solve the Poisson equation accurately. The whole process of meshing, interpolation and pressure computation is carried out using the popular open-source solver OpenFoam®. The method is tested and validated on a classic benchmark test case, namely, the unsteady flow past a cylinder. A 3D multiphase flow simulation is used to generate the reference data and analyze the impact of both, the PIV interrogation and the interpolation on the morphed grid. The simulation uses an Euler-Lagrangian one-way coupling approach to simulate the flow field and the dynamics of seeding particles. The analysis compares the pressure field from the 3D CFD simulation with the solution of a 2D Poisson equation based on the 2D velocity field obtained by either down-sampling the CFD data or by PIV interrogation of synthetic images built from the CFD data. Finally, we challenge the proposed method with the pressure reconstruction in a TR-PIV experiment in similar conditions.

The Resonant Micro Fan for Fluidic Transport, Mixing and Particle Filtering

2001 ◽  
Author(s):  
Ryan J. Linderman ◽  
Subham Sett ◽  
Victor M. Bright
Keyword(s):  
Flow Visualization ◽  
Particle Filtering ◽  
Flip Chip ◽  
Suspended Particle ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Three Dimensional Flow ◽  
Flow Speeds ◽  
Simple Flow

Abstract A novel micro actuator for fluidic transport, mixing and particle filtering is presented. The technology uses a torsionally supported plate driven with an electrostatic signal at first-mode resonance to produce long-term reliable fluidic interactions at the chip level. Resonant frequencies from 10–20kHz have been tested with maximum fan deflections of approximately 30 microns. The resonant fans are fabricated using surface micro-machining techniques and flip-chip assembly. A simple flow visualization technique is also presented using laser illuminated smoke particles contained within the device packaging. The flow visualization setup allows for both overhead and side views as well as infinite ceiling and channel flow simulation in order to fully characterize the three dimensional flow produced by the resonant fans. Flow speeds of over 10 mm/s have been observed to exit single micro fans with large fan arrays producing over 2mL/min of volumetric flow. Fan testing in 600-micron deep channels has demonstrated the potential for suspended particle collection and filtering applications.

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