Validation of dispersion simulations using PDR-FOAM - ukelg

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EXCEEDANCE CURVES Results normally presented as exceedance curves: ←Overpressure exceedance Gas cloud size exceedance → Copyright of Shell Research Ltd October 2012 6
LEAK SCENARIOS An individual release scenario is typically specified by a number of parameters such as: The released material and its conditions (pressure and temperature). The location and orientation and the size of the leak. The wind speed and direction. These parameters are not chosen arbitrarily: Each leak is associated with some item of equipment, the frequency of leaks of differing sizes is found by a “parts count” which supplies the number of items of various types – valves, flanges etc. – and historical data on failure rates for these items. The wind speed and direction are chosen from a probability distribution characterised by the wind rose for the location. Copyright of Shell Research Ltd October 2012 7
Page 1 and 2: GAS DISPERSION WITH OPENFOAM Chris
Page 3 and 4: AGENDA Introduction/Motivation Open
Page 5: DESIGN OVERPRESSURE Understanding
Page 9 and 10: PREVIOUSLY... The Shell methodology
Page 11 and 12: OPENFOAM (1) Open source CFD code.
Page 13 and 14: SOLVER OVERVIEW Basis: Compressibl
Page 15 and 16: THEMODYMAMICS Solver accepts table
Page 17 and 18: FULL-SCALE: JIP RIG ← Physical ri
Page 19 and 20: RESULTS: FLAMMABLE GAS VOLUME Expe
Page 21 and 22: CASE C05 CFD RESULTS Concentration
Page 23 and 24: CASE A02 CFD RESULTS (OPENFOAM UNDE
Page 25 and 26: SUB-GRID JET MODEL ↑ Free choked
Page 27 and 28: SAMPLE EXCEEDANCE CURVE Use JIP ri
Page 29 and 30: SAMPLE EXCEEDANCE CURVE A typical

Validation of dispersion simulations using PDR-FOAM - ukelg

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