SINTEF ICT 5Background: AviationWideroe DH8A on May 1st 2005The Aviation HeraldHammerfest AirportJust before landing the wind speed veered andincreased, creating a tail wind.The increase in the descent rate wascompensated, but was insufficient, and theplane had a touch-down on the right mainlanding gear, with the leg failing and theaircraft sliding on its belly.The aircraft was written off and Widerøe wascriticized for permitting landings under toohigh winds and gustsNorwegian Civil Aviation Authority imposedstricter wind regulations upon the airport.
SINTEF ICT 6Motivation: Wind Energy in complex terrainWind potential might change significantlyvary from one site to anotherExperimental and measurement techniquesAre not good enoughFarm Operators need wind forecast
SINTEF ICTMountain waves: Characteristics• Maximum amplitude on the leeward-side of the hill• Successive hills might enhance or diminish the strength of the waves• The waves are more pronounced when the buoyant andinertial forces are comparable. The ratio is defined by Froude no.
SINTEF ICTCan the flow characteristics be modelled ?11
SINTEF ICT 18Confirm the Pilots experidence "Tail Wind from both sides of the runway"
SINTEF ICTCan we forecast flight conditions ?19The simulations seem to confirm pilots reports BUT…..
SINTEF ICTGlobal scales: seasonal changes,Sea currents etc. Meso scales: effects of largemountains, sea, forest, precipitationMicro scales:terrain effects,mountain wavesEach model is capable of resolving only a particularrange of spatio-temporal scalesThe problem can be handled through nesting ofdifferent models
SINTEF ICTIs the model Computationally efficient and robust?25
SINTEF ICTNJORD: Hardware Configurations26• Technically192 nodes partitioned into 186 nodes, 4 input/ output nodes.186 nodes are shared memory nodes with 8 dual core power 5+ 1.9GHz processors each180 of the computational noes have 32 GB memory eachThe code is parallelized using MPI• MythologicallyNJORD is the God of the wind and fertility as well as the sea and merchantsat sea and therefore was invoked before setting out to sea on hunting andfishing expeditions. He is also known to have the ability to calm the watersas well as fire.
SINTEF ICTConclusion53• A fully functional Multiscale Model for terrain induced turbulence prediction is in place• The prediction system confirms the experiences recorded in the pilots reports and givespossible explanations• The code has been validated extensively against wind tunnel data for cubes, hills, cylinders• There is a scarcity of data for the validation of numerical codes but flight data, wind farmdata, weather station data can be used together to get better insight into the flow atmicroscales.• The data from the different sources can be used for fine tuning the models
SINTEF ICT 54NORWAY IS BEAUTIFULAdil.firstname.lastname@example.org