SURF Model Calibration Strategy

Abstract

SURF and SURFplus are high explosive reactive burn models for shock initiation and propagation of detonation waves. They are engineering models motivated by the ignition & growth concept of high spots and for SURFplus a second slow reaction for the energy release from carbon clustering. A key feature of the SURF model is that there is a partial decoupling between model parameters and detonation properties. This enables reduced sets of independent parameters to be calibrated sequentially for the initiation and propagation regimes. Here we focus on a methodology for fitting the initiation parameters to Pop plot data based on 1-D simulations to compute a numerical Pop plot. In addition, the strategy for fitting the remaining parameters for the propagation regime and failure diameter is discussed.

Verification and Validation of High Explosive Reactive Burn Models Implemented in LANL's EAP and LAP Code Base

“…SURF burn rate is a function of reaction progress variable (lambda), lead shock pressure Ps and local cell pressure P. SURFplus adds second reaction progress variable lambda2. Current fits are in references [13] and [14].…”