Intercalibration Results. MIG: Results for the Inter-code Calibration Exercise
Start Date
3-3-2011 9:35 AM
Description
We are interested in participating in the inter-code calibration and validation exercise in the Fourth Annual AFOSR/NASA/SNL Ablator Modeling Workshop and give an oral presentation on our modeling effort. We are developing a Type II ablation code, i.e. classical thermochemical ablation models with phenomenological in-depth chemistry. It currently has the capability to solve a 1-D thermal ablation problem, and work is being done to extend it to higher dimensions (2-D and 3-D). Numerical scheme employed in the code is time-implicit discontinuous Galerkin (DG) method, which is based on a finite element framework provided by our in-house, Multi-scale Ionized Gas flow code or MIG. The code has been used to solve an arc-jet case, where a test sample, made of carbon phenolic, is exposed to a heat flux value of 1400 W/cm2. The test sample undergoes thermal decomposition at high temperatures, and releases a mixture of gases, or pyrolysis gas. The code solves for thermal response of the material under given external conditions. Material is taken to be porous, and flow of pyrolysis gas through a porous media is considered. Both the Darcy’s friction coefficient and deviation from Darcy’s law are considered to model the flow of pyrolysis gas through porous material. In addition, we also solve for continuity, momentum and energy transport equation for the pyrolysis to correctly account for the net cooling effect provided by the pyrolysis gas as it travels through the ablating system. In our current work, we consider the gas to be at equilibrium at the temperature of the solid material and net pressure of the gas. We have benchmarked our results with the data published by Ahn and Park, and presented them in both 2010 and 2011 AIAA Aerospace Sciences Meeting in Orlando, Florida. We intend to validate our discontinuous Galerkin method with available thermal ablation test data and also broaden the application of our model for general thermal ablation problem through this workshop.
Intercalibration Results. MIG: Results for the Inter-code Calibration Exercise
We are interested in participating in the inter-code calibration and validation exercise in the Fourth Annual AFOSR/NASA/SNL Ablator Modeling Workshop and give an oral presentation on our modeling effort. We are developing a Type II ablation code, i.e. classical thermochemical ablation models with phenomenological in-depth chemistry. It currently has the capability to solve a 1-D thermal ablation problem, and work is being done to extend it to higher dimensions (2-D and 3-D). Numerical scheme employed in the code is time-implicit discontinuous Galerkin (DG) method, which is based on a finite element framework provided by our in-house, Multi-scale Ionized Gas flow code or MIG. The code has been used to solve an arc-jet case, where a test sample, made of carbon phenolic, is exposed to a heat flux value of 1400 W/cm2. The test sample undergoes thermal decomposition at high temperatures, and releases a mixture of gases, or pyrolysis gas. The code solves for thermal response of the material under given external conditions. Material is taken to be porous, and flow of pyrolysis gas through a porous media is considered. Both the Darcy’s friction coefficient and deviation from Darcy’s law are considered to model the flow of pyrolysis gas through porous material. In addition, we also solve for continuity, momentum and energy transport equation for the pyrolysis to correctly account for the net cooling effect provided by the pyrolysis gas as it travels through the ablating system. In our current work, we consider the gas to be at equilibrium at the temperature of the solid material and net pressure of the gas. We have benchmarked our results with the data published by Ahn and Park, and presented them in both 2010 and 2011 AIAA Aerospace Sciences Meeting in Orlando, Florida. We intend to validate our discontinuous Galerkin method with available thermal ablation test data and also broaden the application of our model for general thermal ablation problem through this workshop.