| 引用本文: | 马千里,李思昆,白晓征,等.基于迎风型有限体积法的非结构化网格流场格心数据高质量体绘制方法.[J].国防科技大学学报,2011,33(2):150-156.[点击复制] |
| MA Qianli,LI Sikun,BAI Xiaozheng,et al.High-quality Volume Rendering of Unstructured-grid Cell-centered Data of Flow Fields Based on Upwind FVM[J].Journal of National University of Defense Technology,2011,33(2):150-156[点击复制] |
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| 基于迎风型有限体积法的非结构化网格流场格心数据高质量体绘制方法 |
| 马千里1, 李思昆1, 白晓征2, 曾亮1, 徐华勋1 |
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(1.国防科技大学 计算机学院，湖南 长沙 410073;2.国防科技大学 航天材料与工程学院，湖南 长沙 410073)
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| 摘要: |
| 在计算流体力学领域，对复杂流场进行数值模拟时常用非结构化网格划分空间，并广泛采用迎风型有限体积法求解流场。该方法将数值解存储在非结构化网格单元(控制体)中心，产生格心数据，并假设物理量在相邻单元邻接面上形成“间断”。然而，在可视化此类数据时，目前的重构方法破坏了间断约束，导致“流间断”信息丢失，严重制约了绘制质量。为此，在多遍光线投射算法框架下，设计了基于双控制体的采样点间断态重构方法，确保了邻接面上产生间断的流场值，使重构结果如实反映数值计算结果；并针对该重构过程，设计了基于间断片段的图像合成方案，将数值解中的“流间断”信息传递给绘制数据。实验表明，方法能显著提高绘制质量，清晰准确地显示流场内部特征。 |
| 关键词: 流场可视化 迎风型有限体积法 非结构化网格 格心数据 体绘制 |
| DOI： |
| 投稿日期：2010-09-20 |
| 基金项目:国家973项目(2009CB723803)；国家自然科学基金资助项目(60873120) |
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| High-quality Volume Rendering of Unstructured-grid Cell-centered Data of Flow Fields Based on Upwind FVM |
| MA Qianli1, LI Sikun1, BAI Xiaozheng2, ZENG Liang1, XU Huaxun1 |
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(1.College of Computer, National Univ. of Defense Technology, Changsha 410073, China;2.College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In the field of computational fluid dynamics, the upwind finite volume method (FVM) is widely applied to solve the complicated flows with unstructured grids as the volumetric representation. It produces unstructured-grid cell-centered data at the center of each cell（control volume）with the flow discontinuity constraint on the inner-face between face-adjacencies. For visualization, existing reconstruction approaches violate the discontinuity constraint. As a result, the image has low quality due to the lost information of the discontinuity. This research presented a method to reconstruct the discontinuous states at a sample based on the dual control volumes on the framework of multi-pass raycasting. It guarantees that the field on the inner-face is discontinuous between face-adjacencies, which is in accord with the solution of the numerical computation. We also designed a synthesizer for the discontinuous segments based on the reconstruction above, so that the discontinuity information can be transferred to rendering data. The experiments demonstrate that our approach can obviously improve the image quality and clearly visualize the features in the flows. |
| Keywords: flow visualization upwind FVM unstructured grids cell-centered data volume rendering |
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