ffc v5.0 07 boundary conditions
TRANSCRIPT
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1-1 ANSYS, Inc. Proprietary
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ntroduction to FLUENT
for CAT A V5
Boundary and nitial
Conditions
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1-2 ANSYS, Inc. Proprietary
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Training Manual
FLUENT for CATIA V5 Version 5.0
Introductory Training, Decemer !00"
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Agenda
% Introduction
% Boundary Condition Types: Inlet
% Boundary Condition Types: Outlet% Boundary Condition Types: Wall
% Boundary Condition Types: Periodic
% Defining Species Mass Fractions
% Defining Inputs for Cavitation and OF
% Special Boundary Conditions
% Creating Boundary !roups% Defining and C"anging Boundary Conditions
% Patc" Functionality
% Boundary Profiles #Data Mapping$% %nsteady Boundary Profiles
% Appendi&
& Spatial Data Mapping File For'ats & Ti'e Data Mapping File For'ats
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Introduction• Assign'ent of (oundary conditions #BCs$ is a
crucial part of t"e 'odel setup for anynu'erical si'ulation)
• A nu'(er of (oundary conditions areavaila(le via t"e (oundary condition tool(ar:inlet* outlet* +all and special (oundaryconditions)
• It includes t"e follo+ing steps:
& Define t"e (oundary type for eac" 'es" part#inlet* outlet or +all* etc)$
& For' (oundary groups in +"ic" severalsurfaces s"are t"e sa'e BC in order to 'a,e it'ore easily 'anagea(le
& Specify appropriate (oundary condition valuesfor eac" (oundary type)
•
Faces of t"e geo'etry can (e groupedtoget"er for purposes of specifying (oundaryconditions)
• Boundary conditions can (e 'odified afterdefinition)
BC Tool(ars
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Boundary Condition Types: Inlet• T"e Inlet (oundary condition re-uires t"e user to set
one of t"e follo+ing values: & elocity: inco'pressi(le flo+s only & Mass flo+ rate: all flo+s
& olu'e flo+ rate: inco'pressi(le flo+s only & Pressure #total$: can (e used for all flo+s
• In addition t"e user "as to set t"e InletDirection: nor'al to inlet or (y a specified direction)
• For Tur(ulent Flo+s* t"e source of flo+ is used todeter'ine tur(ulent inlet conditions:
& .ong tu(e* pipe or duct
& Perforated plate: screen/"ole si0e & Fan or (lo+er: inlet flo+ is driven (y fan or (lo+er & 1&ternal environ'ent: a'(ient air or fluid & Ot"er: tur(ulence intensity and tur(ulence lengt" scale
directly specified (y t"e user)
• Te'perature: is set for cases involving te'peratureeffect)
• Species Mass Fractions is set for cases +it"i''isci(le 'i&tures of gases or li-uids)
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Boundary Condition Types: Outlet• T"e Outlet Boundary Condition re-uires
t"e user to set t"e flo+ conditions at t"e
outlet suc" as: & Static pressure #'ost co''only used$
& Alternately* 'ass flo+ rate or olu'etric
flo+ rate or velocity can (e specified)
& Outlet direction #2or'al or given
direction$
& Do+nstrea' conditions for tur(ulent flo+
• .ong tu(e* pipe or duct for internal#pipe$ flo+s)
• 1&ternal 1nviron'ent
& Te'perature and species 'ass fraction
for species calculations* in case of
(ac,flo+ (ac, into t"e do'ain)
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Boundary Condition Types: Wall• Wall (oundary condition:
– 2o3slip (oundary condition for velocity
#i)e)* stationary or 'oving at a ,no+nspeed$)
– For 'oving #translating or rotating$
+alls* ena(le t"e 'oving +all option in
t"e +all BC panel and specify t"e +all
'otion)
– W"en te'perature effects are 'odeled*
t"er'al (oundary conditions 'ust (e
specified at t"e +all:
• Constant te'perature
• Constant "eat flu&
• Te'perature3dependent "eat flu&
#Convection$:
– 4eat transfer coefficient #4TC$ and t"e
a'(ient te'perature are re-uired to
specify t"is BC
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Defining Species Mass Fractions
• Species Mass Fractions "ave to (e
set for inlets and outlets)
• T"e value for eac" species 'ass
fraction s"ould (e (et+een 5 and 6)
• T"e su' of t"e 'ass fractions
s"ould (e e-ual to or less t"an 6)
• T"e Mass fraction of t"e last
species +ill (e deter'ined (ysu(tracting 'ass fraction of all t"e
ot"er species fro' 6)
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Defining Inputs for Cavitation and OF• T"e volu'e fraction of t"e gas
p"ase generated (y cavitation "as
to (e specified for eac" inlet andoutlet)
• Si'ilarly t"e volu'e fraction of
eac" secondary p"ase is to (e
specified +"ile using OF 'odel)
• T"e volu'e or p"ase fraction is a
nu'(er (et+een 5 and 6)
• W"en cavitation/OF is turned on* a
(utton appears on t"e (oundary
condition panel for eac" inlet/outlet)
• Clic, on t"e (utton to get t"e
P"ases Input panel)
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Special Boundary Conditions
• Ot"er inlet (oundary conditions includeinta,e fan* inlet vent and pressure far
field:
& Inta,e Fan: An e&ternal inta,e fan +it"specified pressure 7u'p #fro' a given8fan curve9$* flo+ direction* inta,epressure and te'perature
& Inlet ent: An inlet vent 0one +it"
specified loss coefficient* total pressure#gauge$* flo+ direction and te'perature
& Pressure Far3field: A free strea'(oundary condition at infinity +it" free3strea' Mac" nu'(er)
& 1&"aust Fan and Outlet ent (oundaryconditions can (e created for outlets)
• Interior (oundary condition typesinclude fans* porous 7u'ps and
radiators:
& Fan is used to si'ulate t"e effects of t"efan on t"e flo+ field +it" a 8fan curve9# Flo+ rate vs pressure drop$)
& Porous u'p: si'ulates t"e pressuredrop due to t"e presence of a
8'e'(rane9 +it" ,no+n pressure3dropversus flo+3rate c"aracteristics
& ;adiator: 'odels t"e presence of aradiator or a condenser #i)e) a "eate&c"anger$ using lu'ped para'eters)
• Please see t"e user 'anual for 'oreinfor'ation on t"ese (oundaryconditions)
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Periodic and Sy''etry Boundary Conditions
• T"e sy''etry (oundary conditions
and t"e periodic (oundary
conditions are useful in cuttingdo+n on t"e 'odeling effort:
& Sy''etry is used +"en t"e flo+
and t"e geo'etry "ave natural
planes of sy''etry* +"ic" can (e
e&ploited)
&Periodic (oundary conditions areused +"en t"e flo+ "as repeating
patterns* eit"er along along a
direction #translational periodicity$
or along t"e circu'ference of t"e
do'ain #rotational periodicity$) Periodic planes
;otational Periodic settings Translational Periodic settings
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Creating Boundary !roups
• By default* any e&ternal (oundaries t"atare not specified as inlets or outlets are
grouped into one or 'ore +alls)• To specify (oundary conditions
separately on particular faces* Boundary!roups can (e created using t"e CreateBoundary !roups icon)
& In t"e panel* select faces to (e groupedand t"en set t"e type of (oundarycondition to (e applied)
& A ne+ (oundary group is created onclic,ing O
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Defining and C"anging Boundary Conditions
• To define a (oundary condition
for t"e first ti'e: – Clic, on t"e icon for (oundary
condition type #inlet* outlet or+all ))$ icon
– Select t"e corresponding(oundary group under !roups toopen t"e dialog (o&)
• To c"ange (oundary type for aparticular (oundary group:
– Dou(le clic, on t"e (oundaryentry under !roups)
– C"ange t"e Type in t"e Definitionof Boundaries panel)
• To 'odify or c"ec, any e&isting(oundary conditions* dou(leclic, on t"e (oundary na'e inBoundary Conditions under
Fluent case• Display of (oundary conditions
data in t"e CATIA specificationstree
FLUENT f CATIA V5 V i 5 0
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Patc" Functionality
• T"e patc" functionality can (e used to set t"evalues of particular varia(les on fluid or solidregions)
• To patc" a varia(le: & Clic, on t"e Patc" (utton) & In t"e Patc" alues panel* select t"e Flo+
Property corresponding to t"e fluid or solidregion)
& Select t"e Pat" =uantity #varia(le$ and set it>svalue)
& A Patc" alue ite' is added to t"e Initiali0ation
tree) & if +e 'ove t"e 'ouse pointer to t"e initiali0ationvalues* t"e patc" -uantity +"ic" is used is"ig"lig"ted)
• Once t"e patc" is used during co'putation* it+ill (e de3activated)
& It can (e reactivated for t"e ne&t run using t"erig"t 'ouse (utton)
• Multiple patc"es can (e used in t"e sa'eco'putation)
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Boundary Profiles #Data Mapping$
• To specify non3unifor' (oundary
profiles* clic, t"e data 'apping for
selected data or data 'apping forte'perature
• 1na(le ariant Data or ariant
Te'perature* t"en select Data Mapping)
• Clic, on t"e (utton to specify t"e
location of t"e data file)
•
T"e data files can (e in spread3s"eet#&ls$ or ASCII #t&t$ for'ats)
• %nits for eac" -uantity "ave to (e
specified in t"e data file)
• 2ote t"at spatial and ti'e data 'apping
cannot (e specified for t"e sa'e
(oundary condition si'ultaneously)
• Please refer to t"e Appendi& for t"e data
for'at for 'apping)
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%nsteady Boundary Profiles
• For unsteady si'ulation* ti'e3dependent(oundary profiles specify t"e variation ofa selected (oundary condition +it"
respect to ti'e)
• To set ti'e dependent (oundary profiles*t"e ti'e 'odulation "as to (e definedfirst:
& Clic, on t"e Ti'e Modulation (utton) & Select a file #eit"er in &ls or t&t for'ats$
and clic, O< & A Ti'e Modulations)2 ite' +ill (e added
in t"e specification tree)
• T"e input can t"en (e specified for t"eti'e3dependent (oundary data (yclic,ing on to pop up t"e ariationDefinition panel)
& 4ig"lig"t t"e Ti'e 'odulation (o&* t"enclic, on Ti'e Modulation)2 of t"especification tree +"en t"e ti'e 'odulation is selected*
t"e icon>s color is c"anged to green
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Appendi&
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Spatial Data Mapping File For'ats
• Sa'ple for'ats for te&t and for spread s"eet used in t"e spatial data'apping #(oundary profile$) T"e first ro+ contains t"e "eading* and
eac" colu'n contains respective &* y* 0 and t"e varia(le data
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Ti'e Data Mapping File For'ats
• Sa'ple ti'e data 'apping files in te&t and in spread s"eetfor'ats) T"e first ro+ contains t"e "eading* and eac" of t"e t+o
colu'ns contains respective ti'e and varia(le data)