Ansys 2024 Fluent Fluid Simulation Software Manual
KHAOLO EA 2. LEBALA LA PLATE MOEDI
Lipheo
- Ho theha Geometry ho Ansys Workbench bakeng sa Ansys Fluent
- Ho theha Ansys Fluent bakeng sa Laminar Steady 2D Planar Flow
- Ho theha Mesh
- Ho Khetha Meeli ea Meeli
- Ho matha Lipalo
- Ho Sebelisa Merero ho Bona Tšimo ea Phallo ea Sephetho
- Bapisa le Theoretical Solution o sebelisa Mathematica Code
Tlhaloso ea Bothata
Khaolong ena, re tla sebelisa Ansys Fluent ho ithuta phallo ea laminar ea mahlakore a mabeli holim'a poleiti e sephara e tšekaletseng. Boholo ba poleiti bo nkoa e le bo sa feleng ka tsela ea spanwise kahoo phallo ke 2D ho e-na le 3D. Lebelo la ho kena bakeng sa poleiti e telele ea 1 m ke 5 m/s 'me re tla be re sebelisa moea e le mokelikeli oa lipapiso tsa laminar. Re tla khetha velocity profiles le ho rera profiles. Re tla qala ka ho theha geometry e hlokahalang bakeng sa papiso.
Ho qala Ansys Workbench le ho Khetha Bohlale
- Qala ka ho qala Ansys Workbench. Tobetsa habeli ho Fluid Flow (Fluent) e leng tlas'a Analysis Systems in Toolbox.
Ho qala Ansys DesignModeler
- Khetha Geometry tlas'a Project Schematic ho Ansys Workbench. Tobetsa ka ho le letona ho Geometry ebe u khetha Properties. Khetha Mofuta oa Tlhahlobo ea 2D tlas'a Likhetho tse tsoetseng pele tsa Geometry ho Properties of Schematic A2: Geometry. Tobetsa ka ho le letona ho Geometry ho Project Schematic ebe u khetha Qala Moqapi o Mocha oa Geometry. Khetha Units >> Millimeter joalo ka yuniti ea bolelele ho tsoa ho menu e ho DesignModeler.
- Ka mor'a moo, re tla be re theha geometry ho DesignModeler. Khetha XYPlane ho tsoa lethathamong la Sefate ka letsohong le letšehali ho DesignModeler. Kgetha Sheba Sketch Tobetsa ho tab ya Sketching ho Sefate Outline ebe o khetha Mola
skSketchool. Thala mola o tshekaletseng wa bolelele ba 1,000 mm ho tloha qalong ho ya ho le letona. Etsa bonnete ba hore u na le P qalong ha u qala ho taka mola. Hape, etsa bonnete ba hore u na le H haufi le mola e le hore e rapame le C qetellong ea mola. Khetha litekanyo ka har'a likhetho tsa Sketching. Tobetsa moleng 'me u kenye bolelele ba 1000 mm. Thala mola o otlolohileng ho ea holimo ka bolelele ba limilimithara tse 100 ho qala qetellong ea mola oa pele o tšekaletseng. Etsa bonnete ba hore u na le P ha u qala mola le V e bontšang mola o otlolohileng. Tswela pele ka mola o tshekaletseng wa bolelele ba dimilimitara tse 100 ho ya ka ho le letshehadi ho tloha tshimolohong e latelwang ke mola o mong o emeng o bolelele ba 100 mm. Mohala o latelang o tla ba o rapameng ka bolelele ba limilimithara tse 100 ho qala qetellong ea mola oa pele o otlolohileng ebe o lebisoa ho le letona. Qetellong, koala khutlonnetsepa ka mola o otlolohileng oa 1,000-mm ho tloha 100 mm ka holimo ho tšimoloho 'me o lebise ho le letona.
- Tobetsa tabeng ea Modeling tlas'a Sketching Toolboxes. Kgetha Concept >> Likarolo ho tsoa ho Sketches ho menu. Laola khetha mathōko a tšeletseng a khutlonnetsepa joalo ka Base Objects ebe u khetha Sebelisa ka Lintlha View. Tobetsa Hlahisa ka har'a toolbar. khutlonnetsepa e fetoha bohlooho. Tobetsa ka ho le letona fensetereng ea litšoantšo, khetha Zoom to Fit ebe o koala DesignModeler.
- Hona joale re tla tobetsa Mesh habeli tlas'a Project Schematic ho Ansys Workbench ho bula fensetere ea Meshing. Khetha Mesh ho Outline ea fensetere ea Meshing. Tobetsa ka ho le letona ebe u khetha Hlahisa Mesh. Mesh e mahoashe e entsoe. Khetha Unit Systems >> Metric (mm, kg, N ...) ho tloha botlaaseng ba fensetere ea litšoantšo. Khetha Mesh >> Litaolo >> Face Meshing ho tsoa ho menu. Tobetsa sebakeng se mosehla se haufi le Geometry tlasa Scope in Details of Face Meshing. Khetha khutlonnetsepa fensetereng ea litšoantšo. Tobetsa konopo ea Etsa kopo bakeng sa Geometry ka Lintlha tsa "Face Meshing". Khetha Mesh >> Litaolo >> Siling ho tsoa ho menu ebe u khetha Edge ka holim'a fensetere ea litšoantšo. Khetha likarolo tse 6 tsa khutlonnetsepa. Tobetsa ho Etsa kopo ea Geometry ho "Details of Edge Sizing". Tlas'a Tlhaloso ho "Details of Edge Sizing", khetha Element Size e le Mofuta, 1.0 mm bakeng sa Boholo ba Element, Capture Curvature e le Che, le Thata joalo ka Boitšoaro. Khetha mofuta oa bobeli oa Bias 'me u kenye 12.0 joalo ka Bias Factor. Khetha moeli o mokhuts'oane o kaholimo o otlolohileng 'me u sebelise moeli ona ka Reverse Bias. Tobetsa ho Lehae >> Hlahisa Mesh ho menu ebe u khetha Mesh ho Outline. Mesh e phethiloeng e bontšoa fensetereng ea litšoantšo.
Ke hobane'ng ha re thehile letlooeng le leeme?
Hona joale re tla fetola mabitso a khutlonnetsepa. Khetha lehlakoreng le letšehali la khutlonnetsepa, tobetsa ka ho le letona ebe u khetha Etsa Khetho e rehiloeng.
Kenya inlet e le lebitso ebe o tobetsa konopo ea OK. Pheta mohato ona bakeng sa moeli o otlolohileng oa khutlonnetsepa ebe o kenya lebitso la lebitso. Theha khetho e boletsoeng bakeng sa moeli o ka tlase o molelele o otlolohileng ka ho le letona 'me u e bitse lebota. Qetellong, laola-khetha likarolo tse tharo tse tšekaletseng tse setseng ebe u li bitsa mabota a loketseng. Lerako le loketseng ke lebota la adiabatic le le se nang likhohlano.
- Lebaka la ho sebelisa letlooeng le leeme ke hore re hloka letlooeng le letle haufi le lebota moo re nang le li-gradients tsa lebelo phallong. Hape re kenyelelitse letlooeng le letle moo moeli o qalang ho hlaha holim'a poleiti e bataletseng. Khetha File>>Export…>>Mesh>>FLUENT Input File>> Romella ho tsoa ho menu. Kgetha Boloka e le mofuta: FLUENT Input Files (*.msh). Kenya boundary-layer-mesh .msh the s file lebitso ebe o tobetsa konopo ea Save. Khetha File>> Boloka Morero ho tsoa ho menu. Fana ka lebitso la morero Layer ea Moeli oa Plate Flat. Koala fensetere ea Ansys Meshing. Tobetsa ka ho le letona ho Mesh ho Project Schematic ebe u khetha Update.
Ho qala Ansys Fluent
- U ka qala Phatlalatso ka litsela tse peli tse fapaneng, ebang ke ka ho tobetsa habeli ho Setup tlas'a Project Schematic ho Ansys Workbench kapa mokhoa o ikemetseng ho tloha Fluent 2024 R1 fensetereng ea app ea Ansys 2024 R1. U tla hloka ho bala letlooeng haeba u qala Ho bua hantle ka mokhoa o ikemetseng. Advantagea ho qala Ansys Fluent ka mokhoa o ikemetseng ke hore o ka khetha sebaka sa Ts'ebetso ea Ts'ebetso ea hau moo lihlahisoa tsohle li hlahisoang teng. files tla bolokeha, bona Setšoantšo sa 2.6a). Qala Dimension 2D le Double Precision Solver tsa Fluent. Sheba Double Precision tlas'a Likhetho. Beha palo ea Ts'ebetso ea Tharollo e lekanang le palo ea li-cores tsa khomphutha. Ho lekola palo ea li-cores tsa 'mele, tobetsa linotlolo tsa Ctrl + Shift + Esc ka nako e le ngoe ho bula Task Manager. Eya ho "Performance tab" 'me u khethe CPU ho tloha karolong e ka letsohong le letšehali. U tla bona palo ea li-cores tsa 'mele ka lehlakoreng le ka tlase le letona. Ansys Student e lekanyelitsoe ho palo e kaholimo ho 4 ea mekhoa ea ho rarolla mathata. Koala fensetere ea Task Manager. Tobetsa konopo ea Qala ho qala Ansys Fluent. Tobetsa OK ho koala fensetere ea Key Behavioral Changes haeba e hlaha.
Setšoantšo sa 2.6a) Ho qala Setupo
Ke hobane'ng ha re sebelisa ho nepahala habeli?
Ho nepahala ha habeli ho tla fana ka lipalo tse nepahetseng ho feta tse nepahetseng. - Lekola boholo ba mesh ka ho khetha konopo ea Scale… tlasa Mesh ka Kakaretso Leqepheng la Mosebetsi. Etsa bonnete ba hore Domain Extent e nepahetse 'me u koale fensetere ea Scale Mesh.
- Tobetsa habeli ho Models le Viscous (SST k-omega) tlas'a Seta ka har'a Outline View. Khetha Laminar joalo ka Mohlala oa Viscous. Tobetsa OK ho koala fensetere. Tobetsa habeli ho Maemo a moeli tlas'a Setup ho Outline View. Tobetsa habeli ka tlas'a Zone Leqepheng la Mosebetsi. Khetha Likaroloana e le Mokhoa oa Tlhaloso ea Velocity 'me u behe X-Velocity [m/s] ho isa ho 5.
- Tobetsa konopo ea Etsa kopo e lateloang ke konopo ea Koala.
- Tobetsa habeli ho ideal_wall tlasa Zones. Lekola Shear e Khethiloeng joalo ka Boemo ba Shear 'me u boloke boleng ba lefela bakeng sa khatello ea sekiri e boletsoeng kaha lebota le loketseng ha le khohlane. Tobetsa konopo ea Etsa kopo e lateloang ke konopo ea Koala.
Ke hobane'ng ha re khethile Laminar e le Mohlala oa Viscous?
Bakeng sa lebelo le khethiloeng la mahala la 5 m/s nomoro ea Reynolds e ka tlase ho 500,000 hammoho le poleiti 'me phallo ke laminar. Phallo ea moferefere holim'a poleiti e bataletseng e etsahala ho linomoro tsa Reynolds tse ka holimo ho 500,000. - Tobetsa habeli Mekhoeng tlas'a Tharollo ho Outline View. Khetha Maemo a Khatello le Taelo ea Pele ea Upwind bakeng sa Momentum. Tobetsa habeli ho Reference Values tlasa Seta ho Outline View. Khetha Compute ho tsoa ho seketsoana se leqepheng la Mosebetsi.
Hobaneng re sebelisa mokhoa oa First Order Upwind bakeng sa Spatial Discretization of Momentum?
Mokhoa oa First Order Upwind hangata ha o nepahale empa o kopana hantle ho feta oa Second Order Upwind. Ke mokhoa o tloaelehileng ho qala ka mokhoa oa First Order Upwind qalong ea lipalo le ho tsoela pele ka mokhoa oa Second Order Upwind. - Tobetsa habeli ho Qalisa tlas'a Tharollo ho Outline View, khetha ho Qala ho Tloaelehileng, khetha Compute ho tsoa ho inlet, ebe o tobetsa konopo ea Initialize.
- Tobetsa habeli ho Monitors tlas'a Tharollo ho Outline View. Tobetsa habeli ho Residual tlasa Monitors ho Outline View 'me u kenye 1e-9 e le Litekanyetso tse Felletseng bakeng sa Masala ohle. Tobetsa konopo ea OK ho koala fensetere. Khetha File>> Boloka Project ho tsoa ho menu. Khetha File>> Export >> Nyeoe… ho tsoa ho menu. Boloka Taba File ka lebitso Flat Plate Boundary Layer. CAS.h5
Hobaneng re ile ra beha Melao e Felletseng ho 1e-9?
Ka kakaretso, ho theola litekanyetso tse felletseng, nako e telele ea ho bala e tla nka le ho fana ka tharollo e nepahetseng haholoanyane. Re bona ho Setšoantšo sa 2.12b) hore x-velocity le y-velocity equations li na le masalla a tlaase ho feta a continuity equation. Matsoapo a masala a li-curve bakeng sa li-equation tse tharo a batla a tšoana ka mokhoa o hlabang oa ho ea tlase. - Tobetsa habeli ho Run Calculation tlas'a Tharollo 'me u kenye 5000 bakeng sa Palo ea Liphetoho. Tobetsa konopo ea Bala. Lipalo li tla phethoa ka mor'a ho pheta-pheta ha 193, bona setšoantšo sa 2.12b). Tobetsa ho Copy Screenshot of Active Window to Clipboard, bona Setšoantšo sa 2.12c). Li-Scaled Residuals li ka fetisetsoa ho tokomane ea Lentsoe.
Kamora ho sebetsa
- Khetha tab ea Liphetho ho menu ebe u khetha Etsa >> Line/Rake… tlasa Surface. Kenya 0.2 bakeng sa x0 (m), 0.2 bakeng sa x1 (m), 0 bakeng sa y0 (m), le 0.02 m bakeng sa y1 (m). Kenya x=0.2m bakeng sa Lebitso le Lecha la Sebaka ebe o tobetsa ho Create. Pheta mohato ona makhetlo a mang a mararo 'me u thehe mela e emeng ho x=0.4m ka bolelele ba 0.04 m, x=0.6m ka bolelele ba 0.06 m, le x=0.8m ka bolelele ba 0.08 m. Koala fensetere.
- Tobetsa habeli ho Plots le XY Plot tlasa Liphetho ho Outline View. Tlosa Position ho X Axis tlas'a Likhetho 'me u hlahlobe Boemo holim'a Y-axis. Beha Tataiso ea Plot bakeng sa X ho ea ho 0 le 1 bakeng sa Y. Khetha Velocity… le X Velocity e le X Axis Function. Khetha mela e mene x=0.2m, x=0.4m, x=0.6m, le x=0.8m tlas’a Surfaces.
- Tobetsa konopo ea Axes… fensetereng ea Tharollo ea XY Plot. Khetha X-Axis, hlakola Auto Range tlas'a Options, kenya 6 bakeng sa Maximum Range, khetha Mofuta oa Kakaretso tlas'a Fomati ea Nomoro, 'me u behe Precision ho 0. Tobetsa konopo ea Etsa kopo. Khetha Y-Axis, u se ke ua hlahloba Auto Range, kenya 0.01 bakeng sa Maximum Range, khetha Mofuta o Akaretsang tlas'a Format ea Nomoro, 'me u tobetse konopo ea Etsa kopo. Koala fensetere ea Axes.
- Tobetsa konopo ea Curves… fensetereng ea Tharollo ea XY Plot. Kgetha paterone ya pele tlasa Setaele sa Mola bakeng sa Mokokotlo # 0. Khetha ho se Letshwao bakeng sa Setaele sa Letshwao mme o tobetse konopo ya Etsa kopo. E latelang, khetha Curve # 1, khetha Paterone e latelang e fumanehang bakeng sa Setaele sa Line, ha ho Letšoao bakeng sa Setaele sa Letšoao, ebe o tobetsa konopo ea Etsa kopo. Tsoela pele mokhoa ona oa khetho ka li-curve tse peli tse latelang # 2 le # 3. Koala Li-Curves - Tharollo XY Plot fensetere. Tobetsa konopo ea Boloka / Plot fensetereng ea Tharollo ea XY Plot ebe o koala fensetere ena. Tobetsa ho Copy Screenshot of Active Window to Clipboard, bona Setšoantšo sa 2.16c).
XY Plot e ka kenngoa tokomaneng ea Lentsoe. Khetha tab e hlalositsoeng ho Mosebelisi ho menu le Tloaelo tlas'a Mesebetsi ea Tšimo. Khetha mosebetsi o itseng oa Operand Field ho tsoa ho menu e theoha ka ho khetha Mesh… le Y-Coordinate. Tobetsa ho Khetha 'me u kenye tlhaloso joalokaha ho bontšitsoe ho Figure 2.16f). U hloka ho khetha Mesh… le X Coordinate ho kenyelletsa khokahanyo ea x le ho tlatsa tlhaloso ea mosebetsi oa tšimo. Kenya eta e le Lebitso le Lecha la Mosebetsi, tobetsa ho Defi,ne, ebe o koala fensetere. Pheta mohato ona ho theha mosebetsi o mong oa tšimo ea tloaelo. Lekhetlong lena, re khetha Velocity… le X Velocity joalo ka Mesebetsi ea Tšimo ebe o tobetsa ho Khetha. Tlatsa Tlhaloso joalo ka ha ho bonts'itsoe ho Setšoantšo sa 2.16g) 'me u kenye u-aroha-ka-freestream-velocity e le New Function Name, tobetsa Def, e le' ngoe, ebe u koala fensetere.
Ke hobane'ng ha re ile ra theha khokahanyo e tšoanang le rona?
Hoa etsahala hore ka ho sebelisa khokahanyo e tšoanang le eona, velocity profiles libakeng tse fapaneng tsa streamwise li tla putlama ho pro e le 'ngoe e tšoanang le eona ea velocityfile e ikemetseng ntle le sebaka sa molapo. - Tobetsa habeli ho Plots le XY Plot tlasa Liphetho ho Outline View. Beha X ho 0 le Y ho 1 joalo ka Tsela ea Polo. Tlosa Maemo ho X Axis 'me u se ke oa hlahloba Boemo holim'a Y-axis tlas'a Likhetho. Khetha Custom Field Functions le eta bakeng sa Mosebetsi oa Y-Axis ebe u khetha Custom Field Functions le o arohaneng-by-freestream-lobelo bakeng sa Mosebetsi oa X-Axis. Beha sebaka file blasius.dat bukeng ea hau ea ho sebetsa. Sena file e ka kopitsoa ho sdcpublications.com tlas'a tab ea Litjarollo bakeng sa buka ena. Sheba Setšoantšo sa 2.19 bakeng sa khoutu ea Mathematica e ka sebelisoang ho hlahisa khopolo ea Blasius velocity pro.file bakeng sa phallo ea moeli oa laminar holim'a poleiti e bataletseng. Joalo ka mohlalaample, bukeng ena bukana ea ho sebetsa ke nqa:\Users\jmatsson. Tobetsa ho Load File. Khetha Files ea mofuta: Tsohle Files (*) ebe u khetha file blasius.dat ho tsoa bukeng ea hau e sebetsang. Khetha libaka tse 'nè x=0.2m, x=0.4m, x=0.6m, x=0.8m, le tse laetsoeng file Khopolo.
Tobetsa konopo ea Axes…. Khetha Y-Axis fensetereng ea Axes-Solution XY Plot 'me u khethe Auto. Range. Beha Bonyane Range ho 0 le Maximum Range ho 10. Beha Mofuta ho phaphamala le Precision ho 0 tlas'a Fomati ea Nomoro. Kenya Sehlooho sa Axis joalo ka eta ebe o tobetsa ho Etsa kopo. Khetha X-Axis, hlakola Auto Range tlas'a Options, kenya 1.2 bakeng sa Maximum Range, khetha Mofuta oa float tlas'a Fomati ea Nomoro, 'me u behe Precision ho 1. Kenya Axis Title e le u/U. Tobetsa ho Etsa kopo ebe o Koala fensetere. Tobetsa konopo ea Curves… fensetereng ea Tharollo ea XY Plot. Khetha mokhoa oa pele tlas'a Line Style bakeng sa Curve # 0, bona Setšoantšo sa 2.16a). Khetha ho se na Letšoao bakeng sa Setaele sa Letšoao ebe o tobetsa konopo ea Etsa kopo. E latelang, khetha Curve # 1, khetha Paterone e latelang e fumanehang bakeng sa Setaele sa Line, ha ho Letšoao la Setaele sa Letšoao, ebe o tobetsa konopo ea Etsa kopo. Tsoela pele mokhoa ona oa khetho ka li-curve tse peli tse latelang # 2 le # 3. Koala Li-Curves - Tharollo XY Plot fensetere. Tobetsa konopo ea Boloka / Plot fensetereng ea Tharollo ea XY Plot ebe u koala fensetere ena.
- Tobetsa ho Copy Screenshot of Active Window to Clipboard, bona Setšoantšo sa 2.16c). XY Plot e ka kenngoa tokomaneng ea Lentsoe. Khetha tab e hlalosoang ke mosebelisi ho menu le Custom. Khetha mosebetsi o itseng oa Operand ho tsoa ho menu e theoha ka ho khetha Mesh… le X-Coordinate. Tobetsa ho Khetha 'me u kenye tlhaloso joalokaha ho bontšitsoe ho Setšoantšo sa 2.17e). Kenya rex joalo ka Lebitso le Lecha la Mosebetsi, tobetsa ho Hlalosa, ebe o Koala fensetere. Tobetsa habeli ho Plots le XPlotsot tlasa Liphetho ho Outline View. Beha X ho 0 le Y ho 1 tlas'a Tataiso ea Plot.
Tlosa Position ho X Axis 'me u se khethe Beha sebakeng sa Y-axis tlas'a Likhetho. Kgetha Wall Fluxes le Skin Friction Coefficient bakeng sa Mosebetsi wa Y-Axis ebe o kgetha Custom Field Functions le rex bakeng sa XX-AxisFunction. Beha sebaka file "Theoretical Skin Friction Coefficient" bukeng ea hau e sebetsang. Tobetsa Load File. Khetha Files ea mofuta: Tsohle Files (*) ebe u khetha file "Theoretical Skin Friction Coefficient". Khetha lerako tlas'a Surfaces le e laetsoeng file Skin Friction ka tlas'a File Lintlha. Tobetsa ho Lilepe… Konopo. Sheba X-Axis, hlahloba lebokose la Log tlas'a Likhetho, kenya Re-x e le Sehlooho sa Axis, 'me u se ke ua hlahloba Auto. Range tlas'a Option beha Minimum ho 100 le Maximum ho 1000000. Beha Mofuta ho phaphamala le Precision ho 0 tlas'a Number Format ebe o tobetsa ho Etsa kopo. Sheba Y-Axis, hlahloba lebokose la Log tlas'a Likhetho, kenya Cf-x e le Label, 'me u se ke ua hlahloba Auto. Range, beha Minimum ho 0.001 le Maximum ho 0.1, beha Type to float, Precision to 3, ebe o tobetsa ho Etsa kopo. Koala fensetere. Tobetsa ho Boloka / Plot fensetereng ea Tharollo ea XY Plot. Tobetsa konopo ea Curves… fensetereng ea Tharollo ea XY Plot. Khetha mokhoa oa pele tlas'a Lin. e Style for Curve # 0. Kgetha ho se Letshwao bakeng sa Setaele sa Letshwao ebe o tobetsa konopo ya Etsa kopo. Ha, khetha Curve # 1, khetha Paterone e latelang e fumanehang bakeng sa Setaele sa Mola, ha ho Letšoao la Setaele sa Letšoao, ebe o tobetsa konopo ea Etsa kopo. Koala fensetere ea Curves - Solution XY Plot. Tobetsa konopo ea Boloka / Plot fensetereng ea Tharollo ea XY Plot ebe u koala fensetere ena. Tobetsa ho Copy Screenshot of Active Window to Clipboard, bona Setšoantšo sa 2.16c). XY Plot e ka kenngoa tokomaneng ea Lentsoe.- Khopolo
- Khaolong ena, re bapisitse Ansys Fluent velocity profiles le theoretical Blasius velocity profile bakeng sa phallo ea laminar holim'a poleiti e bataletseng. Re fetotse khokahanyo e mpe ea lebota ho ba khokahanyo e ts'oanang bakeng sa ho bapisa profiles libakeng tse fapaneng tsa streamwise. Khokahano ea ho tšoana e hlalosoa ke moo y (m) e leng khokahanyo e tloaelehileng ea lebota, e hlalosoang ke
- moo y (m) e leng khokahanyo e tloaelehileng ea lebota, U (m/s) ke lebelo la molapo o sa lefelloeng, x (m) ke sebaka se hole le tšimoloho ea lerako le ）) m2 /s) ke viscosity ea kinematic ea mokelikeli. U (m/s) ke lebelo la molapo o sa lefelloeng, x (m) ke sebaka se hole ho tloha qalong ea lerako le m2 /s) ke viscosity ea kinematic ea mokelikeli.
Re boetse re sebelisitse lebelo la "streamwise" le "non-dimensional streamwise velocity" moo u leng "dimensional velocity pro".file.
U/U e ne e reriloe khahlano le bakeng sa Ansys Fluent velocity profiles ha e bapisoa le khopolo ea Blasius ea profile 'me kaofela ha tsona li ile tsa oela ka lehlakoreng le le leng ho ea ka tlhaloso ea ho itšoana.
Blasius boundary layer equation e fanoa ke
Botenya ba lera la moeli bo hlalosoa e le sebaka sa ho tloha leboteng ho ea sebakeng seo lebelo la moeli oa moeli le fihlileng ho 99% ea boleng ba mahala.
Bakeng sa lera la moeli oa laminar re na le polelo e latelang ea khopolo-taba bakeng sa phapang ea botenya ba moeli o nang le bohole ba x le nomoro ea Reynolds didir.
- Polelo e tsamaellanang le botenya ba lera la moeli moeling o moferefere o fanoa ke
- Coefficient ea khohlano ea letlalo ea lehae e hlalosoa e le khatello ea ho kuta ea lebota ea lehae e arotsoe ke khatello e matla.
- Theoretical local friction coefficient bakeng sa phallo ea laminar e khethoa ke
- le bakeng sa phallo ea moferefere, re na le kamano e latelang
Litšupiso
- Çengel, YA, le Cimbala JM, Metheo ea Mechanics ea Mekelikeli le Likopo, Khatiso ea Pele, McGraw-Hill, 1.
- Richards, S., Cimbala, JM, Martin, K., ANSYS Workbench Tutorial - Moeli oa Moeli holim'a Flat Plate, Univesithi ea Penn State, 18 May 2010 Revision.
- Schlichting, H., le Gersten, K., Boundary Layer Theory, 8th Revised and Atolod Edition, Springer, 2001.
- White, FM, Fluid Mechanics, Khatiso ea 4, McGraw-Hill, 1999.
Boikoetliso
- Sebelisa liphetho tse tsoang ho Ansys Fluent ketsiso khaolong ena ho fumana botenya ba lera la moeli maemong a pharalletseng joalo ka ha ho bonts'itsoe tafoleng e ka tlase. Tlatsa lintlha tse sieo tafoleng. Sekhahla ke lebelo la sekhahla sa moeli ho tloha leboteng le lekanang le botenya ba moeli oa moeli 'me U ke lebelo la mahala la molapo.
x (m) o (mm) E bua hantle
o (mm) Khopolo
Phapang ea Liphesente U 8 (Mof)
U (Mof)
v (m2/s)
Re x 0.2 .0000146 0.4 .0000146 0.6 .0000146 0.8 .0000146 - Fetola boholo ba element ho 2 mm bakeng sa letlooeng 'me u bapise liphetho ho XY Plots ea coefficient ea ho hohla ha letlalo khahlano le nomoro ea Reynolds ka boholo ba element ba 1 mm bo sebelisitsoeng khaolong ena. Bapisa liphetho tsa hau le mohopolo.
- Fetola lebelo la ho phallela ho 3 m/s 'me u thehe Plot ea XY ho kenyelletsa velocity profiles ho x = 0.1, 0.3, 0.5, 0.7, le 0.9 m. Theha Plot e 'ngoe ea XY e nang le velocity pro e tšoanang le eonafiles bakeng sa lebelo lena le tlase la molapo o sa lefelloeng mme o thehe Plot ea XY bakeng sa coefficient ea khohlano ea letlalo khahlano le nomoro ea Reynolds.
- Sebelisa liphetho tse tsoang ho Ansys Fluent simulation ho Exercise 2.3 ho fumana hore na botenya ba moeli oa moedi maemong a streamwise joalo ka ha ho bonts'itsoe tafoleng e ka tlase. Tlatsa tlhahisoleseding e sieo tafoleng.ke lebelo la lera la moeli sebakeng se hole ho tloha leboteng le lekanang le botenya ba lera la moeli le U ke lebelo la molapo o sa lefelloeng.
x (m) o (mm) E bua hantle
o (mm) Khopolo
Phapang ea Liphesente U 8 (Mof)
U (Mof)
v (m2/s)
Re x 0.1 .0000146 0.2 .0000146 0.5 .0000146 0.7 .0000146 0.9 .0000146
Lethathamo la 2.2 Papiso pakeng tsa Thetsenolo le khopolo ea botenya ba lera la moeli
Fetola lebelo la phallo ea mahala ho boleng bo thathamisitsoeng tafoleng e ka tlase 'me u thehe Plot ea XY ho kenyelletsa velocity pro.files ho x = 0.2, 0.4, 0.6, le 0.8 m. Theha Plot e 'ngoe ea XY e nang le velocity pro e tšoanang le eonafiles bakeng sa lebelo la hau la ho phalla mahala 'me u thehe Plot ea XY bakeng sa coefficient ea khohlano ea letlalo khahlano le nomoro ea Reynolds.
| Moithuti | X-Lebelo U (Mof) | Boholo Range (Mof) bakeng sa X Lebelo Leano |
| 1 | 3 | 4 |
| 2 | 3.2 | 4 |
| 3 | 3.4 | 4 |
| 4 | 3.6 | 4 |
| 5 | 3.8 | 4 |
| 6 | 4 | 5 |
| 7 | 4.2 | 5 |
| 8 | 4.4 | 5 |
| 9 | 4.6 | 5 |
| 10 | 4.8 | 5 |
| 11 | 5.2 | 6 |
| 12 | 5.4 | 6 |
| 13 | 5.6 | 6 |
| 14 | 5.8 | 6 |
| 15 | 6 | 7 |
| 16 | 6.2 | 7 |
| 17 | 6.4 | 7 |
| 18 | 6.6 | 7 |
| 19 | 6.8 | 7 |
| 20 | 7 | 8 |
| 21 | 7.2 | 8 |
Khoasolla PDF: Ansys 2024 Fluent Fluid Simulation Software Manual