1 / 20

Modelling laser percussion drilling

Modelling laser percussion drilling. Kees Verhoeven. Overview. The process Laser induced melting Splashing & Solidification NumLab in this project. Overview. The process Laser induced melting Splashing & Solidification NumLab in this project. Melting. Splashing. Solidification.

fifi
Download Presentation

Modelling laser percussion drilling

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Modelling laser percussion drilling Kees Verhoeven Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  2. Overview • The process • Laser induced melting • Splashing & Solidification • NumLab in this project Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  3. Overview • The process • Laser induced melting • Splashing & Solidification • NumLab in this project Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  4. Melting Splashing Solidification The process Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  5. The process: analysis • Time scales: • Melting to sec. • Splashing sec. • Gas dynamics sec. • One dimensional model for melting • ‘Shallow water’ equations for splashing and solidification • One dimensional model for recoil pressure Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  6. Overview • The process • Laser induced melting • Splashing & Solidification • NumLab in this project Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  7. Stefan formulation • Heat equation in both regions • Stefan condition • Energy supply Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  8. Enthalpy method • Heat equation in enthalpy form • Enthalpy known function of temperature Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  9. Comparison • Front-tracking and front-fixing methods vs. fixed-domain methods • Enthalpy method can deal with ‘mushy’ regions • Enthalpy method easily extended to 2D Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  10. Overview • The process • Laser induced melting • Splashing & Solidification • NumLab in this project Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  11. Splashing & Solidification • Dimensionless parameters • Assumptions • Inviscid • Irrotational • Leading-order effects • Recoil pressure (splashing) • Convection vs. diffusion (solidification) Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  12. Solidification • Unknowns: • Equations: • Conservation of mass • Burgers’ equation • Heat equation Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  13. Solidification: numerics SLM Burgers SLM Mass Heat eq. Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  14. Note that: • Burgers’ equation exhibits shocks • Velocity has compact support, so leading edge shock • This shock appears in the equation for conservation of mass • Melt amasses behind leading edge shock Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  15. Overview • The process • Laser induced melting • Splashing & Solidification • NumLab in this project Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  16. Solidification: numerics SLM Burgers SLM Mass Heat eq. Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  17. Using different packages • Sepran (FEM) • PPPack (Splines) • LaPack • VTK (Visualisation) • Own codes (Matlab, C/C++) Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  18. Example 1: Burgers & mass Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  19. Example 2: Visualisation Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

  20. Example 2: Visualisation Modelling laser percussion drilling - A-DAY ’01 - 22/11/01

More Related