非结构弹性体动网格方法应用策略及改进

张斌; 杨涛; 丰志伟; 张青斌; 葛健全; 霍霖

doi:10.13224/j.cnki.jasp.2017.03.017

非结构弹性体动网格方法应用策略及改进

doi: 10.13224/j.cnki.jasp.2017.03.017

国防科学技术大学航天科学与工程学院，长沙 410073

基金项目: 国家自然科学基金（51375486）; 航天支撑技术基金（1602010114002）

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出版历程
- 收稿日期: 2015-07-19
- 刊出日期: 2017-03-28

Application strategy and improvement of unstructured dynamic grid method based on elasticity analogy

摘要

摘要: 针对3种代表性的经典弹性体动网格方法，从网格最大变形能力、质量评价指标和空间分布趋势3个方面综合分析了各方法的网格变形特性，重点总结了各方法的适用范围.结合工程实际，研究了特定问题的弹性体动网格应用策略.最后，整合各经典弹性体动网格方法的优势提出了改进方法，并通过NACA 0006翼型的超声速俯仰振荡加以验证.研究结果表明：基于面积的弹性体法适用于加密型网格，而基于距离的弹性体法适用于均匀型网格，该应用策略可为工程问题提供指导.改进方法效果明显，在大变形时相对基于距离的弹性体法的各项网格质量增幅均在10%以上，相对基于面积的弹性体法的最小网格质量增幅几乎达到4倍，并且在数值模拟中具有较高的精度，可显著增强弹性体法的鲁棒性.
- 动网格 /
- 弹性体 /
- 非结构网格 /
- 应用策略 /
- 加权改进
Abstract: Taking the field of application as a focal point, three classical dynamic grid methods based on elasticity analogy were analyzed in many ways, such as deformation capability, deformation quality and spatial distribution. Combined with engineering demand, the application strategy for grid deformation was presented. Finally, a improvement was proposed for integrating advantages of classical dynamic grid methods based on elasticity analogy, and then verified through pitch oscillation of NACA 0006 airfoil in hypersonic condition. Results show that, when faced with densified grids, the area modification can be controlled better, but faced with uniform grids, the distance modification is more suitable, so this application strategy can provide a guidance for engineering. Secondly, the improvement is accurate in simulation, its all grid quality parameters exceed 10% than classical method based on distance, whats more, its minimum grid quality parameter is about four times the classical method based on area. In conclusion, the improvement is effective in strengthening the robustness of classical elasticity analogy.
- dynamic grid /
- elasticity analogy /
- unstructured grid /
- application strategy /
- weighted improvement

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