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Flow Disturbance of Flow due to Bends and Obstacles, etc. Time Transients and Spatial Distribution of Fluid Force on Structure Surface FLAVOR-3D: 3-D Fluid Load Analysis Code Applicable to situations in which structure movement induced by fluid flow does not affect the fluid flow. The fluid and structural vibration are uncoupled. Fluctuation of pressure load on components surfaces due to fluid flow is calculated. IMPACT

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Inlet Nozzle Downcomer 1.5D 0.3D D Re: 3 10 7 Mesh: 150,000 50 kPa 0 1 2 Time (s) 0 Power Spectrum Density 204060 Frequency (Hz) 10db 4-loop PWR measured value Analysis FLAVOR-3D: 3-D Fluid Load Analysis Code - Application to Pressure Oscillation on PWR Core Barrel -

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IMPACT FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code Dynamic structural analysis Fluid force: F(t) Dynamic displacement: x(t) Moving boundary Fluid dynamics analysis x(t) x(t+ t) Flow - Analysis of flow-induced vibration in a single-phase cross flow. - Coupling of fluid flow and dynamic displacement of structure. - Moving boundary in fluid flow analysis by the ALE method.

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IMPACT Flow Vertical cylinder was enforcedly oscillated with frequency f Outline of Test Vortex shedding downstream of the cylinder was measured F vk : vortex shedding frequency Forced oscillation frequency f and vortex shedding frequency f vk were normalized by Karman vortex frequency f k Karman vortex under the condition without oscillation was measured F k : Karman vortex frequency FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Verification (1) -

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f : forced oscillation frequency, f k : Karman vortex frequency, f vk : vortex shedding frequency, a : oscillation amplitude, d : diameter of cylinder. (1) Re=490, a/d=0.1 0 0.20.4 0.6 0.81.01.2 0.4 0.6 0.8 1.0 1.2 f vk / f k f / f k : Test : Analysis 0.5 f vk / f = 1 2 3 46 IMPACT Vortex shedding is not affected by oscillation of the cylinder Vortex shedding coincides with oscillation of the cylinder : “Lock-in” occurs FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Verification (1) Result of a/d=0.1 -

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(2) Re=490, a/d=1.0 0 0.20.4 0.60.8 1.0 1.2 0.4 0.6 0.8 1.0 1.2 0.5 6 3 4 2 f vk / f = 1 : Test : Analysis IMPACT f : forced oscillation frequency, f k : Karman vortex frequency, f vk : vortex shedding frequency, a : oscillation amplitude, d : diameter of cylinder. f vk / f k f / f k “Lock-in” phenomena was well reproduced FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Verification (1) Result of a/d=1.0 -

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IMPACT Flow Cylinder with Free End Weight (0.3 lb) Fixed End The cylinder oscillated due to vortex. Oscillation amplitude was measured. Outline of Test FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Validation by Analysis of Free Vibration Test-

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IMPACT 6 2.5 Amplitude of vibration (mm) Reduced water velocity 5 4 3 2 1 0 2.01.51.0 0.5 Analysis Test result* * King, R., et al.: J. Sound and Vibration, 29(2), 169-188 (1973) FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Validation Result -

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A A' Internal Pump (2.12 m 3 /s, each) 13 m Lower Plenum (552 K) Control Rod Housing In-core Monitor Housing Analysis Region View A-A’ IMPACT Calculated stress on the in-core monitor housing : 9 N/mm 2 (20% lower than the measurement) FLAVOR-2D: 2-D Fluid-Structure Interaction Analysis Code - Application to ABWR 1/6 Sector Test Analysis -

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