EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

3D Airflow Simulation in a Counterflow Virtual Impactor (CVI)

Vincent Vocourt,Laboratoire de Météorologie Physique (LaMP)

Université de Clermont-Ferrand, FranceThesis : Etalonnage et simulation numérique d’une sonde à impaction virtuelle (CVI)

dans le cadre de l’étude des propriétés physico-chimiques des gouttes nuageuses

Presented by Philippe Nacass, Météo France, CAM, Brétigny, France

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Mesh refinementsaround CVI tip and through porous tube

Gambit (stuctured and unstrucutured meshes)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Mesh refinementsaround CVI tip and through porous tube

Gambit (stuctured and unstrucutured meshes)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Mesh refinementsaround CVI tip and through porous tube

Gambit (stuctured and unstrucutured meshes)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Simulated flow conditions

F 3 (=F 1- F 2)

F 1

F 2"st agnat ion plane"

Vin = 150 m.s-1 (at -20 mm) T = 273 K Turbulence intensity 8%

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Simulated flow conditions

F 3 (=F 1- F 2)

F 1

F 2"st agnat ion plane"

F2 : 98 % F3 : 2 %

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Simulated flow conditions

F 3 (=F 1- F 2)

F 1

F 2"st agnat ion plane"

F1 : V = 6 m.s-1 T = 300 K Turbulence intensity 6%

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Simulated flow conditions

F 3 (=F 1- F 2)

F 1

F 2"st agnat ion plane"

Porous size : 40 m Permeability : 2.378 10-11 m2

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Velocity field of air stream linesWind tunnel : Vin = 40 m.s-1 Vout = 150 m.s-1

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Velocity field of air stream lines

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Velocity field of air stream lines

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectories

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectoriesDiameter >> 10m

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectoriesDiameter << 5m

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectories around CVI tip

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Velocity field of air stream linesVin = 150 m.s-1 V

CF = 1 L.mn-1

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Velocity field of air stream lines

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectories in the probeDiameter << DCut(50%)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectories in the probeDiameter >> DCut(50%)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Particle trajectories in the probeDiameter DCut(50%)

EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002

Modeling has to continue !Modeling has to continue !