133306 Sim Flow Roleofcfd Wp Eng

8/22/2019 133306 Sim Flow Roleofcfd Wp Eng

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Th Rl CFD Rl L Dss

SUMMARY

Ths r rlts tw ht ss, mdcl sct dc, hs

hld , d dstrl ctrl l s mls tht llstrt

hw SldWrs Flw Smlt c hl ds rs crt

th st ssl rdct dss wh dl wth ht trsr

fd fw rlms. SldWrs Flw Smlt s tllt, s

t-s cmttl fd dmcs (CFD) rrm tht wll cltt

th wr ds rs wh s SldWrs r ds crt

w h i t e p A p


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t Sdwrks F Smuan Arac

Hat trasr problms always crop up wh dsg grs work o lc-

troc products that ca b damagd asly by ovrhatg. Hat sks solv

ovrhatg problmbut whats th bst hat sk dsg ad placmt o

gv lctroc dvc? Ad how ca a dsg gr choos th bst, mo

cost-ctv hat sk or hs purpos wthout buldg ad brakg maycostly prototyps?

Compltly drt kds o problms occur wh dsgg a mdcal su

to dvc or a applcato that ds th hghst possbl ow rat or

a gv prssur drop (sucto), wth lmtd rcrculato wth th dvc,

ad th most uorm vlocty profl possbl at th sucto had. Aga, th

qusto arss o how to choos th bst dsg th most cost- ad tm

ctv way.

Ad th sam prcpls hold tru or cosumr products, such as bakg

ovs, ad or dustral qupmt that cluds cotrol valvs.

Th xampls mtod abov ar problms that dsg grs may ac

thr day-to-day work, ad ar also hghly rprstatv o th vryday

problms coutrd by dsgrs o may drt products.

Computatoal ud dyamcs (CFD) s a smulato tool that ca b o grat

assstac solvg such problms. Vry ot, howvr, CFD programs ar

vry complx ad dfcult to us, spcally by dsg grs who hav

ot had a grat dal o advacd ducato th physcs o ud ows.

SoldWorks Flow Smulato ors tllgt, asy-to-us CFD to dsg

grs who us SoldWorks or dsg crato.

Dsgn 1: ha snk fr xrna crnc dvc

Th frst hat sk s mat or a pc o lctroc qupmtsay a su

vllac camrathat wll b usd o th xtror o buldgs. To protc

t rom th lmts, th dvc has to b wll saldbut wth o vt

most o th hat trasr wll tak plac through o sd o th closur

oly. Th hat sk ths cas has to ad rmovg th hat. Th mau

acturr o th dvc has dcdd o a o-th-shl hat sk, ad ts

dsg cat b chagd.

How ca th dsg gr fd cost-ctv ways to cras th coolg

wth such crcumscrbd paramtrs?

Startg wth a SoldWorks modl o th commrcal hat sk (Fgur 1), th

dsgr ca s that, as th orc o gravty acts dowwards, th hat rom

closur wll b coductd to th hat sks fs, ad rmovd by lghtr ar

rsgthat s, atural covcto. To tst a shld dsg, th dsgr plac

a covr ovr th hat sk ad th ds to dtrm whthr that wll g

at a chmy ctcratg mor ar ow, ad thus coolg th lctroc

product mor ctvly.

T H e R o l e o F C F D i n R e A l l i F e D e S i g n S

Vry ot, CFD programs ar vry

complx ad dfcult to us, sp-cally by dsg grs who havot had a grat dal o advacd

ducato th physcs o ludows. SoldWorks Flow Smulato

ors tllgt, asy-to-usCFD to dsg grs who us

SoldWorks or dsg crato.


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FiGURe 1: ManDaTeD HeaT Sink

Wth SoldWorks Flow Smulato, th dsg gr uss th programs

Projct Wzard to st up th ow aalyss. Th Projct Wzard lts th dsg

df th ut systm to b usd, th ud as ar, ad th typ o aalyss as

xtral cojugat hat trasr problm; apply gravty to drv th ow or th

r covcto; put th ambt tmpratur ad prssur codtos; ad

slct th dsrd rsult rsoluto automatc mshg lvlall wth a sg

asy-to-us trac.

Th xt stp taks th gr to th SoldWorks Flow Smulato aalyss

tr, whr h ca apply th hat powr load o th hat sk wth a smpl

rght-clck mu opto that also walks hm through sttg th locato or th

load ad powr put.

Fally, th dsg gr dfs th ovrall dsg objctvs o th aaly

maxmum hat sk tmpratur, ad maxmum ar vlocty as goals, makg

t possbl or hm to motor thos valus durg th calculato ad crat a

tabl o th computd valus wh th aalyss has b compltd.

FiGURe 2: HeaT Sink WiTHouT SHieLD HeaT Sink WiTH SHieLD

To DeTeRMine WHeTHeR THe HeaT Sink WiLL peRFoRM beTTeR WiTH oR

WiTHouT THe SHieLD, THe DeSign engineeR RunS a SoLiDWoRkS FLoW

SiMuLaTion CFD anaLySiS


Wth SoldWorks Flow Smulato,

th dsg gr uss th pro-grams Projct Wzard to st up thlow aalyss.


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paramr wu Sd w Sd

tmraur (C) 62.0 55.9

tAble 1: CoMpuTeD aveRage TeMpeRaTuRe FoR eaCH veRSion oF THe DeSi

FiGURe 3: anaLySiS ReSuLTS, SHoWing veLoCiTy CuTS. WaRMeR CoLoRS

inDiCaTe HigHeR veRTiCaL veLoCiTy. THe DeSign WiTH THe SHieLD HaS

gReaTeR veLoCiTy aRounD THe HeaT Sink FinS.

FiGURe 4: veLoCiTy CuTS THRougH a veRTiCaL SeCTion. ReSuLTS SHoW

THaT THe veRSion WiTH THe SHieLD DeMonSTRaTeS FaR gReaTeR veLoCiTWiTHin THe MoDeL.

FiGURe 5: TeMpeRaTuRe CuTS THRougH a CRoSS-SeCTion. THiS ReSuLT

pRoveS THaT THe MoDeL WiTH THe SHieLD TRanSFeRS MoRe HeaT To THe a



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FiGURe 6: SoLiD TeMpeRaTuRe CuTS THRougH a CRoSS-SeCTion. THeSe

ReSuLTS SHoW THaT THe MoDeL WiTH THe SHieLD iS DRaMaTiCaLLy CooLe

WiTH TeMpeRaTuReS in a Range FRoM 55C To 57C. THe HeaT Sink WiTHo

THe SHieLD HaS TeMpeRaTuReS enTiReLy above THe 55C To 57C Range.

Th SoldWorks Flow Smulato studs show that th addto o a sh

to a vrtcally moutd hat sk producs a sgfcat cras cool-

gwth a 10.9 prct dcras avrag tmpratur wh th two

dsgs ar compard.

Dsgn 2: ha snk fr man c n an crnc ncsur

Th scod hat sk ds to protct th ma chp, stalld wth othr l

troc compots, a lctroc closur. i ths cas, th dsg g

ds to dty ad slct th bst hat sk shap or th purpos.

FiGURe 7: eLeCTRoniC enCLoSuRe MoDeL

Th dsg show Fgur 7 s a SoldWorks assmbly modl o th lc-

troc closur, cludg th ma hat sk. A stalld a blows ar to

closur, through th hat sk, ad out through th outlt slots to cool th

hatd lctroc compots by orcd covcto. Whch o two drtly

shapd commrcally avalabl hat sks rsults th lowst ma chp tmpratur?

Th dsg gr ca dtrm ths wth SoldWorks Flow Smulato

vry straghtorward way. As th prvous aalyss, th dsg gr us

th Projct Wzard to st up th tral cojugat hat trasr problm. To

df th a ths orcd ow aalyss, th dsgr ca choos th appr

prat a profl rom a lst avalabl th egrg Databas bult to

SoldWorks Flow Smulato.

To df th a ths orcd ow

aalyss, th dsgr ca choosth approprat a prol rom

a lst avalabl th egrgDatabas bult to SoldWorksFlow Smulato.



6/14T H e R o l e o F C F D i n R e A l l i F e D e S i g n S

nxt, th dsgr uss volumtrc hat sourcs to rprst th compo

hatd durg us ad sts goals o maxmum ad avrag tmpraturs

o both th ma chp ad hat sk. Wh th aalyss has b compltd

h ca vw th rsultg tmpraturs both as surac plots o th lctr

compots, ad as cut plots through th ud ad solds. Th dsg g-

r ca also crat vlocty vctors that mak t asr to vsualz ow pa

trs through whch th a blows ar ovr th hat sk ad aroud th

closur.

No. 1 AND No. 2: CoMpeTing SHapeS oF THe HeaT Sink SoLiDWoRkS

FLoW SiMuLaTion HeLpS engineeRS CoMpuTe THe TeMpeRaTuRe oF

THe eLeCTRoniC enCLoSuRe.

tAble 2: CoMpuTeD MaxiMuM anD aveRage TeMpeRaTuReS oF THe Main

CHip WiTH eaCH oF THe TWo HeaT SinkS

FiGURe 8: anaLySiS ReSuLTS in a TeMpeRaTuRe CuT pLoT, SHoWing THe

FRonT vieW, aS obTaineD FoR HeaT Sink no. 1. THe 30-CoLoR paLeTTe

SHoWS TeMpeRaTuReS in THe 50F To 100F Range.

FiGURe 9: TeMpeRaTuRe CuT pLoT, SHoWing THe TopvieW, aS obTaineD F

HeaT Sink no. 1



FiGURe 10: TeMpeRaTuRe CuT pLoT, SHoWing THe SiDe vieW, aS obTaineD

FoR HeaT Sink no. 1

FiGURe 11: THe veLoCiTy veCToRS, SHoWing a SiDe vieW, aS obTaineD F

HeaT Sink no. 1

FiGURe 12: anaLySiS ReSuLTS in a TeMpeRaTuRe CuT pLoT, SHoWing THe

FRonT vieW, aS obTaineD FoR HeaT Sink no. 2

FiGURe 13: TeMpeRaTuRe CuT pLoT, SHoWing THe Top vieW, aS obTaineD

FoR HeaT Sink no. 2



FiGURe 14: TeMpeRaTuRe CuT pLoT, SHoWing THe SiDe vieW, aS obTaineD

FoR HeaT Sink no. 2. aS THe puRpoSe oF THe SoLiDWoRkS FLoW SiMuLaT

anaLySiS WaS To enabLe THe CHoiCe oF THe beTTeR HeaT Sink SHape FoR

a Main CHip inSTaLLeD WiTH oTHeR eLeCTRoniC CoMponenTS in an eLeC-

TRoniC enCLoSuRe, anD THe ReSuLTS SHoW 17.5 peRCenT ReDuCTion in

SoLiD TeMpeRaTuReS in HeaT Sink no. 2, THaT SHape pRoveD To be beTTe

Dsgn 3: Mdca sucn dvc scrn

i ths dsg, th dsg gr ds to dty th bst scr shap oa mdcal sucto dvc, to allow th hghst ow rat or a gv sucto, lm

rcrculato wth th dvc, ad also crat th most uorm vlocty prof

at th sucto had.

Fgur 15 shows th SoldWorks assmbly modl o th dvc, cludg

a scr wth tragular cuts. Flow trs th dvc through a cocal had

ows through th scr, ad dow th tub. Th dsgr sts up th t

al ow th Projct Wzard, ad dfs th lt ad outlt prssur co

dtos. Th goal o th SoldWorks Flow Smulato aalyss s to dtrm

th ow rat at a gv prssur drop or ach o two scr dsgso

wth tragular cuts as show th modl, ad o wth crcular cutswh

stalld th sucto dvc. Hr, addto to th computd volum o

rat, th gr uss ow trajctors to show th paths tak by rpr-

statv ar molculs through th dvc. H ca also crat a amato

o th ow trajctors to produc a bttr vsualzato o ow pattrs ad

aras o rcrculato.

FiGURe 15

Th goal o th SoldWorks Flow

Smulato aalyss s to dtrmth low rat at a gv prssurdrop or ach o two scr dsgs.



No. 1 AND No. 2: THe TWo SCReen SHapeS unDeR STuDy

tAble 3: CoMpuTeD voLuMeTRiC FLoW RaTeS oF eaCH SCReen SHape

FiGURe 16: pReSSuRe CuT pLoTS FoR eaCH DeSign. boTH DeSignS Have

SiMiLaR pReSSuRe pRoFiLeS.

FiGURe 17: veLoCiTy CuT pLoTS WiTH veLoCiTy veCToRS FoR eaCH DeSig

boTH DeSignS Have SiMiLaR veLoCiTy pRoFiLeS aT THe SuCTion HeaD.

FiGURe 18: TRajeCToRy pLoTS SHoWing ReCiRCuLaTion zone


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FiGURe 19: TRajeCToRy pLoTS in a ReCiRCuLaTion zone FoR eaCH DeSig

WHiLe boTH DeSignS Have SoMe ReCiRCuLaTion, THe zone FoR THe TRia

guLaR DeSign iS LaRgeR.

As statd abov, th purpos o ths aalyss was to slct th bst prorm-

g scr had or th mdcal sucto dvc. Th rsults show a 7.8 prc

hghr ow rat wh usg th scr wth crcular cuts, ad both dsgs

hav rasoably qual vlocty profls at th sucto had. Th crcular cut

dsg, howvr, has a smallr rcrculato zomakg t clar that th

crcular cut dsg wll provd supror prormac, basd upo th orgadsg crtra.

Dsgn 4: husd ovn

i ths dsg o a houshold bakg ov, th dsg gr ca us

SoldWorks Flow Smulato to study th ar ow pattr ad tmpratur

dstrbuto, ad optmz th dsg to achv th uorm hot ar crculato

rqurd or uorm bakg. Th CFD program abls study o hat tras

by coducto, covcto, ad radato wth th ov.

Fgur 20 shows th SoldWorks modl o th ov, wth thr bakg trays a

caks o ach. Th objctv o th SoldWorks Flow Smulato aalyss s tooptmz th ow o hatd ar, by studyg th atural covcto wth th

ov ad chckg th fal surac tmpratur o th objct bg bakd. T

do ths, th dsgr troducs hot ar at 120C to th ov chambr, ras

th hat rom a tal tmpratur o 20C.

FiGURe 20: SoLiDWoRkS MoDeL oF oven WiTH THRee baking TRayS

anD CakeS

Th objctv o th SoldWorks

Flow Smulato aalyss s to larwhch tray dsg wll provd th

optmal low o hatd ar by study-g th atural covcto wthth ov.



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FiGURe 21: TeMpeRaTuRe aT THe SuRFaCe oF THe CakeS FoR DeSign 1

Fgur 21 shows th surac tmpratur rsults, wth uv hatg o th

objct placd o th stack o trays. Bcaus hot ar s lghtr tha coolr ar,

hot ar rss to th top, ad th tmpratur dcrass at lowr hghts.

Th dsg gr uss th wzard to st up a smulato o tral ow by

trg th tal ov tmpratur. H dfs th vlocty o th hot ar alowth ts tmpratur at th sx lts, as wll as th prssur codto at th

outlt. To vsualz th rsults, th gr ca plot th tmpratur dstrbu

to aroud th bakg objct, ad or bttr vsualzato o ar ow dstrbut

h ca plot ow trajctors ad vlocty cotour plots at multpl sctos.

SoldWorks Flow Smulato ca also dtrm whthr th prormac o

th ov wll b mor fct th dsgr adds ar ow dctors. Ad to

optmz th dsg, th gr ca study both th dal locato ad umb

o lts that troduc hot ar to th ov.

FiGURe 22: aiR veLoCiTy anD DiSTRibuTion aT THe Top TRay aRounD THe

Cake WiTH DeSign 2

FiGURe 23: aiR veLoCiTy anD DiSTRibuTion aT THe boTToM TRay aRounD

THe Cake WiTH THe SeConD DeSign

Bcaus hot ar s lghtr tha

coolr ar, th hot ar rss to thtop, ad th tmpratur dcrass

at lowr hghts.

SoldWorks Flow Smulato ca also

dtrm whthr th prormaco th ov wll b mor fct

th dsgr adds ar ow dctors.



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FiGURe 24: FLoW TRajeCToRieS in THe oven FoR THe Five-CuTouT TRay,

WiTH TeMpeRaTuReS

Dsgn 5: Cnr vav

i ths dsg, th gr ds to optmz th dsg o a cotrol valv o

mmum prssur loss, ad also to prdct possbl cavtato problms.

Th gr uss CFD to prorm a tral ar ow smulato through th

valv. CFD rsults gv th gr a dtald udrstadg o th ow pat

tr such a valv by mas o aalyss rsults showg ow vlocty, prs-

sur, ad partcl trajctors. SoldWorks Flow Smulato maks t asy to

calculat th prssurs at th opgs ad through th tr modla lv

o comprhsv ormato that caot asly b obtad through physca

tstg bcaus o th dfculty placg strumtato to provd sufc

ormato about whats happg sd th valv.

Fgur 27 shows th 3D SoldWorks modl o th valv. Th dsg g

sts up th smulato wth th hlp o th SoldWorks Flow Smulato Wzar

H dfs th vlocty at whch ar trs th valv at th lt, ad applsstatc prssur quvalt to th atmosphr at th outlt.

FiGURe 25: SoLiDWoRkS 3D vaLve MoDeL

SoldWorks Flow Smulato maks

t asy to calculat th prssurs atth opgs ad through th tr

modla lvl o comprhsvormato that caot asly bobtad through physcal tstg.



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FiGURe 26: veLoCiTy DiSTRibuTion WiTH gRaDienT veCToRS SHoWn

THRougHouT THe MoDeL

FiGURe 27: veLoCiTy TRajeCToRieS HeLp in THe STuDy oF THe FLoW paTTe

FiGURe 28: pReSSuRe DiSTRibuTion pLoT WiTH iSobaRS SHoWS THe poSS

biLiTy oF CaviTaTionWHiCH pRoveS noT To be a pRobLeM in THe CaSe

THiS ConTRoL vaLve.

Th prssur rsult plot shows mmum loss o prssur or ths valv dsg

Th prssur at th rgo whr cavtato could occur bcam gatv,

dcatg that th valv would ot xprc cavtato. i addto to plots,

SoldWorks Flow Smulato ca also produc a tabl showg th ow valu

at ay pot, surac, or volum wth th modl.


i addto to plots, SoldWorks Flow

Smulato ca also produc a tablshowg th low valus at ay pot,surac, or volum wth th modl.


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w w w . s o l i d w o r k s . c

Dsslt Sstms SldWrs Cr.300 br aCcrd, Ma 01742 uSaph: 1 800 693 9000otsd th uS: +1 978 371 5011eml: @sldwrs.cm

Cncusn

Whthr dsgg hat sks or lctroc products, mdcal sucto

dvcs, cosumr products, or dustral cotrol valvs, dsg grs

d to kow whch dsg s bst, whl avodg th xtra costs ad tm

volvd buldg too may prototyps ordr to achv thr goals.

Computatoal ud dyamcs smulato tools ca hlp mt ths challgSoldWorks Flow Smulato s a tllgt, asy-to-us tool that allows

you to tst multpl dsgs ad scaros to study hat trasr ad ud

ow problms so you ca optmz your dsg wthout spdg xcss

tm ad moy th procss.

133306 Sim Flow Roleofcfd Wp Eng

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Transcript of 133306 Sim Flow Roleofcfd Wp Eng