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CFD Simulation of Jet Cooling andImplementation of Flow Solvers inGPU
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Numerical Analysis, NA.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In rolling of steel into thin sheets the final step is the cooling of the finished product on the Runout Table. In this thesis, the heat transfer into a water jet impinging on a hot flat steel plate was studied as the key cooling process on the runout table. The temperature of the plate was kept under the boiling point. Heat transfer due to a single axisymmetric jet with different water flow rate was compared to cases of a single jet and two jets in 3D. The RANS model in ANSYS Fluent was used with the k −ε model in transient simulation of the axisymmetric model and steady flow for the 3D cases. Two different boundary conditions, constant temperature and constant heat flux were applied at the surface of the steel plate. The numerical results were consistent between 2D and 3D and compared well to literature data. The time dependent simulation for the 3D model requires very large computational power which motivated an investigation of simpler flow solvers running on a GPU platform. A simple 2D Navier-Stokes solver based on Finite Volume Method was written using OpenCL which can simulate flow and heat convection. A standard CFD problem named "Lid Driven Cavity" in 2D was chosen as validation case and for performance measurement and tuning of the solver.


Abstract [sv]

När stål valsas till plåt är det sista steget att kyla den färdiga produkten på utrullningsbordet (ROT). I detta arbete studeras värmetransporten i en vattenstråle som faller in mot en varm plan platta som är den viktigaste kylprocessen på utrullningsbordet. Plattans temperatur hölls under kokpunkten. Värmeövergång i en ensam rotationssymmetrisk stråle med olika hastighet jämförs med en och två strålar i 3D modeller. RANS-modellering i ANSYS Fluent med k −ε turbulensmodell används för transientberäkning för rotationssymmetri och för stationär beräkning för 3D-fallen. Två olika randvillkor, konstant temperatur och konstant värmeflöde, används vid plattan. De numeriska resultaten är konsistenta mellan rotationssymmetri och 3D och jämförbara med litteratur-data.

Transient simulering av 3D modellerna kräver stora datorresurser vilket motiverar en undersökning om enklare strömningsmodeller som kan köra på GPU-plattform. En enkel 2D Navier-Stokes-lösare baserad på Finita Volym-metoden implementerades i OpenCL för simulering av konvektiv värmetransport. Lid Driven Cavity-problemet i 2D valdes för verifiering och tidtagning.

Place, publisher, year, edition, pages
2013. , 62 p.
TRITA-MAT-E, 2013:30
National Category
Computational Mathematics
URN: urn:nbn:se:kth:diva-123971OAI: diva2:631610
Subject / course
Numerical Analysis
Educational program
Master of Science - Scientific Computing
Physics, Chemistry, Mathematics
Available from: 2013-06-22 Created: 2013-06-22 Last updated: 2013-06-22Bibliographically approved

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