Influence of cyclic variance on the performance of URANS for pulsating flow upstream of an automotive catalyst monolith

Research output: Contribution to conferenceOther

Abstract

CFD predictions using the URANS equations have been compared to phase-averaged and instantaneous PIV pulsating flow fields in a planar diffuser upstream of a catalyst monolith. URANS qualitatively capture the velocity and vorticity fields, in particular the spatial and temporal evolution of the main vortices in the diffuser during the acceleration phase of the cycle. However, they over-predict vortex intensity and hence its residual strength at the beginning of successive pulses. Instantaneous PIV measurements show there is a significant cycle-to-cycle variation in the position and structure of the vortices within the diffuser. This serves to "diffuse" the phase-averaged vortex strength. Alternative simulation techniques such as LES or DNS will be needed if the cyclic variation is to be correctly predicted as this will affect conversion efficiency.
Original languageEnglish
Publication statusPublished - 2015
EventInternal Combustion Engines ICE2015 - London, United Kingdom
Duration: 2 Dec 20153 Dec 2015

Conference

ConferenceInternal Combustion Engines ICE2015
Abbreviated titleICE2015
CountryUnited Kingdom
CityLondon
Period2/12/153/12/15

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Vortex flow
Catalysts
Vorticity
Conversion efficiency
Flow fields
Computational fluid dynamics

Bibliographical note

The full text is currently unavailable on the repository

Cite this

Influence of cyclic variance on the performance of URANS for pulsating flow upstream of an automotive catalyst monolith. / Saul, Jonathan M.; Porter, S. J.; Mat Yamin, A. K.; Medina, Humberto J.; Aleksandrova, Svetlana; Benjamin, Stephen F.

2015. Internal Combustion Engines ICE2015, London, United Kingdom.

Research output: Contribution to conferenceOther

Saul, JM, Porter, SJ, Mat Yamin, AK, Medina, HJ, Aleksandrova, S & Benjamin, SF 2015, 'Influence of cyclic variance on the performance of URANS for pulsating flow upstream of an automotive catalyst monolith' Internal Combustion Engines ICE2015, London, United Kingdom, 2/12/15 - 3/12/15, .
@conference{1311534f1036419a847ca3c85422f9c8,
title = "Influence of cyclic variance on the performance of URANS for pulsating flow upstream of an automotive catalyst monolith",
abstract = "CFD predictions using the URANS equations have been compared to phase-averaged and instantaneous PIV pulsating flow fields in a planar diffuser upstream of a catalyst monolith. URANS qualitatively capture the velocity and vorticity fields, in particular the spatial and temporal evolution of the main vortices in the diffuser during the acceleration phase of the cycle. However, they over-predict vortex intensity and hence its residual strength at the beginning of successive pulses. Instantaneous PIV measurements show there is a significant cycle-to-cycle variation in the position and structure of the vortices within the diffuser. This serves to {"}diffuse{"} the phase-averaged vortex strength. Alternative simulation techniques such as LES or DNS will be needed if the cyclic variation is to be correctly predicted as this will affect conversion efficiency.",
author = "Saul, {Jonathan M.} and Porter, {S. J.} and {Mat Yamin}, {A. K.} and Medina, {Humberto J.} and Svetlana Aleksandrova and Benjamin, {Stephen F.}",
note = "The full text is currently unavailable on the repository; Internal Combustion Engines ICE2015, ICE2015 ; Conference date: 02-12-2015 Through 03-12-2015",
year = "2015",
language = "English",

}

TY - CONF

T1 - Influence of cyclic variance on the performance of URANS for pulsating flow upstream of an automotive catalyst monolith

AU - Saul, Jonathan M.

AU - Porter, S. J.

AU - Mat Yamin, A. K.

AU - Medina, Humberto J.

AU - Aleksandrova, Svetlana

AU - Benjamin, Stephen F.

N1 - The full text is currently unavailable on the repository

PY - 2015

Y1 - 2015

N2 - CFD predictions using the URANS equations have been compared to phase-averaged and instantaneous PIV pulsating flow fields in a planar diffuser upstream of a catalyst monolith. URANS qualitatively capture the velocity and vorticity fields, in particular the spatial and temporal evolution of the main vortices in the diffuser during the acceleration phase of the cycle. However, they over-predict vortex intensity and hence its residual strength at the beginning of successive pulses. Instantaneous PIV measurements show there is a significant cycle-to-cycle variation in the position and structure of the vortices within the diffuser. This serves to "diffuse" the phase-averaged vortex strength. Alternative simulation techniques such as LES or DNS will be needed if the cyclic variation is to be correctly predicted as this will affect conversion efficiency.

AB - CFD predictions using the URANS equations have been compared to phase-averaged and instantaneous PIV pulsating flow fields in a planar diffuser upstream of a catalyst monolith. URANS qualitatively capture the velocity and vorticity fields, in particular the spatial and temporal evolution of the main vortices in the diffuser during the acceleration phase of the cycle. However, they over-predict vortex intensity and hence its residual strength at the beginning of successive pulses. Instantaneous PIV measurements show there is a significant cycle-to-cycle variation in the position and structure of the vortices within the diffuser. This serves to "diffuse" the phase-averaged vortex strength. Alternative simulation techniques such as LES or DNS will be needed if the cyclic variation is to be correctly predicted as this will affect conversion efficiency.

M3 - Other

ER -