1. 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, France Thesis : 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

2. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Mesh refinements around CVI tip and through porous tube Gambit (stuctured and unstrucutured meshes)

3. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Mesh refinements around CVI tip and through porous tube Gambit (stuctured and unstrucutured meshes)

4. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Mesh refinements around CVI tip and through porous tube Gambit (stuctured and unstrucutured meshes)

5. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Simulated flow conditions V in = 150 m.s -1 (at -20 mm) T = 273 K Turbulence intensity 8%

6. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Simulated flow conditions F2 : 98 %F3 : 2 %

7. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Simulated flow conditions F1 : V = 6 m.s -1 T = 300 K Turbulence intensity 6%

8. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Simulated flow conditions Porous size : 40  m Permeability : 2.378 10 -11 m 2

9. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Velocity field of air stream lines Wind tunnel : V in = 40 m.s -1 V out = 150 m.s -1

10. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Velocity field of air stream lines

11. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Velocity field of air stream lines

12. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories

13. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories Diameter >> 10  m

14. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories Diameter << 5  m

15. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories around CVI tip

16. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Velocity field of air stream lines V in = 150 m.s -1 V CF = 1 L.mn -1

17. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Velocity field of air stream lines

18. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories in the probe Diameter << D Cut(50%)

19. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories in the probe Diameter >> D Cut(50%)

20. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Particle trajectories in the probe Diameter  D Cut(50%)

21. EUFAR Experts Workshop, Capua (Italy), 16–20 September 2002 Modeling has to continue !