. . . "RIV/00216305:26210/14:PU111794" . "10.1088/1755-1315/22/2/022022" . . . . . "RIV/00216305:26210/14:PU111794!RIV15-MSM-26210___" . "Reduced order model of draft tube flow"@en . . "P(GA13-23550S), P(LO1202)" . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "[71125A533083]" . "draft tube, proper orthogonal decomposition, POD, reduced order model, vortex rope"@en . . . "IOP Conference Series: Earth and Environmental Science" . "Swirling flow with compact coherent structures is very good candidate for proper orthogonal decomposition (POD), i.e. for decomposition into eigenmodes, which are the cornerstones of the flow field. Present paper focuses on POD of steady flows, which correspond to different operating points of Francis turbine draft tube flow. Set of eigenmodes is built using a limited number of snapshots from computational simulations. Resulting reduced order model (ROM) describes whole operating range of the draft tube. ROM enables to interpolate in between the operating points exploiting the knowledge about significance of particular eigenmodes and thus reconstruct the velocity field in any operating point within the given range. Practical example, which employs axisymmetric simulations of the draft tube flow, illustrates accuracy of ROM in regions without vortex breakdown together with need for higher resolution of the snapshot database close to location of sudden flow changes (e.g. vortex breakdown). ROM based on" . . . "Swirling flow with compact coherent structures is very good candidate for proper orthogonal decomposition (POD), i.e. for decomposition into eigenmodes, which are the cornerstones of the flow field. Present paper focuses on POD of steady flows, which correspond to different operating points of Francis turbine draft tube flow. Set of eigenmodes is built using a limited number of snapshots from computational simulations. Resulting reduced order model (ROM) describes whole operating range of the draft tube. ROM enables to interpolate in between the operating points exploiting the knowledge about significance of particular eigenmodes and thus reconstruct the velocity field in any operating point within the given range. Practical example, which employs axisymmetric simulations of the draft tube flow, illustrates accuracy of ROM in regions without vortex breakdown together with need for higher resolution of the snapshot database close to location of sudden flow changes (e.g. vortex breakdown). ROM based on"@en . "Reduced order model of draft tube flow" . "1755-1315" . . "Rudolf, Pavel" . "41700" . . "22" . "2"^^ . "10"^^ . "2"^^ . "26210" . . "1" . . . "Reduced order model of draft tube flow" . "\u0160tefan, David" . . "Reduced order model of draft tube flow"@en .