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ABAQUS AC3D8R Element Quality Assessment

ABAQUS AC3D8R Element Quality Assessment. By Michael Hubenthal. ABAQUS AC3D8R Element Quality Assessment. Background AC3D8R is an acoustic element used for modeling wave propagation in Abaqus Explicit It can be used to model fluid-structure interaction behavior

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ABAQUS AC3D8R Element Quality Assessment

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  1. ABAQUS AC3D8R Element Quality Assessment By Michael Hubenthal

  2. ABAQUS AC3D8R Element Quality Assessment Background AC3D8R is an acoustic element used for modeling wave propagation in Abaqus Explicit It can be used to model fluid-structure interaction behavior The accuracy of the structural response is dependent on the accuracy of the fluid mesh The AC3D8R accuracy can vary with element shape

  3. Relevant Geometric Characteristics Element Size Aspect Ratio Skew Orientation ABAQUS BENCHMARKS MANUAL

  4. Element Verification Concept Abaqus verification tests look at the first node in a mesh of ideally shaped elements This project will perform verification of the AC3D8R element for geometry that is less than ideal This project will develop a baseline comparison using ideal geometry and a known wave This project will compare the geometric characteristics to the baseline results

  5. Methodology Calculate theoretical wave speed in water Set up the baseline model and develop a known wave to propagate through the model (triangle wave) Build and test a fluid mesh with varying aspect ratio

  6. …Methodology Build and test a fluid mesh with varying mesh density Build and test a fluid mesh with varying element skew Build and test a fluid mesh with varying element orientation relative to wave Compare results from all the cases

  7. Element Size 1 meter length of fluid Cube shaped elements Vary element size only

  8. Element Size Results

  9. Element Density 1 meter length of fluid Cube shaped elements Constant volume Compare to element size test to consider if multiple elements affect the results

  10. Element Density Results

  11. Aspect Ratio 1 meter length of fluid Constant volume Vary element aspect ratio

  12. Aspect Ratio Results

  13. Element Skew 1 meter length of fluid Same number of elements as baseline Compare to baseline to consider if element skew affects the results

  14. Element Skew Results

  15. Element Orientation 1 meter length of fluid Same number of cube elements as baseline Compare to baseline to consider if element orientation affects the results

  16. Element Orientation Results

  17. Propagation Length 1 meter 10 meter 10 meter length of fluid Same element edge lengths as element size test models Compare to element size test to consider if element propagation length affects the results

  18. Propagation Length Results

  19. Conclusions Element length in the direction of wave propagation is the most important geometric element characteristic The modeled fluid extent should be minimized to prevent losses

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