?url_ver=Z39.88-2004&rft_id=-&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Frepo.poltekbangsby.ac.id%2Fid%2Feprint%2F3166%2F&rft.title=PENGARUH+TANDEM+STAGGER+CYLINDER+TERHADAP+PERFORMA%0D%0AHIDRODINAMIKA+DRAG+TURBIN&rft.creator=AKMAL%2C+RAFI&rft.subject=TL+Motor+vehicles.+Aeronautics.+Astronautics&rft.description=Turbin+Savonius+memiliki+konstruksi+sederhana+dan+kemampuan+self-starting+yang%0D%0Abaik%2C+tetapi+performanya+masih+terbatas+akibat+drag+negatif+pada+returning+blade+serta%0D%0Apembentukan+wake+yang+menyebabkan+kehilangan+energi.+Penelitian+ini+bertujuan%0D%0Amenganalisis+pengaruh+empat+circular+cylinder+dalam+konfigurasi+tandem-stagger%0D%0Aterhadap+performa+hidrodinamika+turbin+Savonius+menggunakan+simulasi%0D%0AComputational+Fluid+Dynamics+dua+dimensi.+Simulasi+dilakukan+menggunakan%0D%0Apendekatan+Unsteady+Reynolds-Averaged+Navier%E2%80%93Stokes+dan+model+turbulensi+SST+k%CF%89+dengan+fluida+kerja+air%2C+kecepatan+aliran+bebas+1+m%2Fs%2C+bilangan+Reynolds+3%2C6+%C3%97+10%E2%81%B5%2C%0D%0Aserta+sudut+stagger+45%C2%B0.+Variasi+spacing+ratio+yang+digunakan+adalah+S%2FD+%3D+0%2C8%3B+0%2C9%3B%0D%0A1%2C0%3B+dan+1%2C1.+Model+numerik+diverifikasi+melalui+uji+grid+independence+dan+divalidasi%0D%0Adengan+membandingkan+kecenderungan+hasil+simulasi+terhadap+penelitian%0D%0Asebelumnya.+Parameter+yang+dianalisis+meliputi+distribusi+tekanan%2C+pola+aliran%2C%0D%0Akarakteristik+wake%2C+coefficient+of+moment%2C+dan+coefficient+of+power.+Hasil+penelitian%0D%0Amenunjukkan+bahwa+seluruh+variasi+cylinder+mampu+meningkatkan+performa%0D%0Adibandingkan+turbin+konvensional.+Konfigurasi+S%2FD+%3D+0%2C9+menghasilkan+performa%0D%0Aterbaik+dengan+Cm+maksimum+sebesar+0%2C515+dan+Cp+maksimum+sebesar+0%2C373%2C+yang%0D%0Ameningkat+masing-masing+sekitar+41%2C5%25+dan+62%25+dibandingkan+turbin+konvensional.%0D%0AKonfigurasi+tersebut+mampu+mengarahkan+aliran+menuju+advancing+blade%2C%0D%0Amengurangi+drag+negatif+pada+returning+blade%2C+serta+menghasilkan+pola+wake+yang%0D%0Alebih+teratur.+Dengan+demikian%2C+konfigurasi+tandem-stagger+cylinder+efektif+digunakan%0D%0Asebagai+metode+passive+flow+control+untuk+meningkatkan+performa+hidrodinamika%0D%0Aturbin+Savonius.%0D%0AKata+kunci%3A+turbin+Savonius%2C+tandem-stagger+cylinder%2C+hidrodinamika%2C+CFD%2Ccoefficient+of+moment%2C+coefficient+of+power.%0D%0A%0D%0A%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%0D%0A%0D%0AThe+Savonius+turbine+has+a+simple+construction+and+good+self-starting+capability%2C+but%0D%0Aits+performance+remains+limited+due+to+negative+drag+on+the+returning+blade+and+wake%0D%0Aformation+that+causes+energy+losses.+This+study+analyzes+the+effect+of+four+circular%0D%0Acylinders+arranged+in+a+tandem-stagger+configuration+on+the+hydrodynamic%0D%0Aperformance+of+a+Savonius+turbine+using+two-dimensional+Computational+Fluid%0D%0ADynamics+simulations.+The+simulations+were+performed+using+the+Unsteady+ReynoldsAveraged+Navier%E2%80%93Stokes+approach+and+the+SST+k-%CF%89+turbulence+model%2C+with+water+as%0D%0Athe+working+fluid%2C+a+free-stream+velocity+of+1+m%2Fs%2C+a+Reynolds+number+of+3.6+%C3%97+10%E2%81%B5%2C+and%0D%0Aa+stagger+angle+of+45%C2%B0.+The+tested+spacing+ratios+were+S%2FD+%3D+0.8%2C+0.9%2C+1.0%2C+and+1.1.+The%0D%0Anumerical+model+was+verified+through+a+grid-independence+test+and+validated+against%0D%0Aprevious+studies.+The+evaluated+parameters+included+pressure+distribution%2C+flow%0D%0Apatterns%2C+wake+characteristics%2C+coefficient+of+moment%2C+and+coefficient+of+power.+The%0D%0Aresults+showed+that+all+cylinder+configurations+improved+turbine+performance%0D%0Acompared+with+the+conventional+design.+The+S%2FD+%3D+0.9+configuration+produced+the+best%0D%0Aperformance%2C+with+a+maximum+Cm+of+0.515+and+a+maximum+Cp+of+0.373%2C+representing%0D%0Aimprovements+of+approximately+41.5%25+and+62%25%2C+respectively.+Therefore%2C+tandemstagger+cylinders+are+effective+passive+flow-control+devices+for+improving+the+torque%0D%0Aand+power+performance+of+a+hydrokinetic+Savonius+turbine.%0D%0AKeywords%3A+Savonius+turbine%2C+tandem-stagger+cylinder%2C+hydrodynamics%2C+CFD%2C%0D%0Acoefficient+of+moment%2C+coefficient+of+power.&rft.date=2026-07-15&rft.type=Tugas+Akhir&rft.type=NonPeerReviewed&rft.format=text&rft.language=id&rft.identifier=https%3A%2F%2Frepo.poltekbangsby.ac.id%2Fid%2Feprint%2F3166%2F1%2F30423008_RAFI%2520AKMAL.pdf&rft.identifier=++AKMAL%2C+RAFI++(2026)+PENGARUH+TANDEM+STAGGER+CYLINDER+TERHADAP+PERFORMA+HIDRODINAMIKA+DRAG+TURBIN.++%5BTugas+Akhir%5D+++++&rft.relation=-&rft.identifier=-