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Figure 1 – NSTX Upper Umbrella Assembly Upgrade Design: Version 4

Figure 1 – NSTX Upper Umbrella Assembly Upgrade Design: Version 4. Figure 2 – Single Segment 3-Strap Assembly Solid Model: Version 4. Figure 3 – ANSYS Multiphysics Analysis Block Diagram. Figure 4 – Single Segment 3-Strap Assembly FEA Model: Mesh.

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Figure 1 – NSTX Upper Umbrella Assembly Upgrade Design: Version 4

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  1. Figure 1 – NSTX Upper Umbrella Assembly Upgrade Design: Version 4

  2. Figure 2 – Single Segment 3-Strap Assembly Solid Model: Version 4

  3. Figure 3 – ANSYS Multiphysics Analysis Block Diagram

  4. Figure 4 – Single Segment 3-Strap Assembly FEA Model: Mesh

  5. Figure 5 – Single Segment 3-Strap Assembly Electric Model Results: Voltage

  6. Fig. 6 – Single Segment 3-Strap Assembly Electric Model Results: Current Density

  7. Figure 7 – Single Segment 3-Strap Assembly Electric Model Results: Joule Heat

  8. Fig. 8 – Single Segment 3-Strap Assembly Thermal Model Results: Temperature

  9. Study: Determine Current Best-Practice to Perform Magnetostatic Analysis in ANSYS 12.0 WorkBench • New SOLID236/237 magnetic analysis elements • Have both Magnetic Vector Potential (MVP) and Line Edge method capability. Replaces SOLID97 and SOLID117. • Compatible with WB generated Electric, Thermal, and Static Structural analyses meshes. • No 3D MVP or Line Edge contact elements • Requires conformal mesh with shared nodes across the joints, which makes modeling assemblies including frictional and pressure-dependent electric and thermal contact impossible, or • Non-conformal/ dissimilar mesh, with duplicate nodes across the joint. Magnetic coupling using CPINTF command requires nearly-matched meshing, which is difficult to achieve in a large assembly. • Above problems are greatly reduced if modeling the air enclosure, and modeling the magnetic coupling across the joints, are not necessary • May be valid for materials with a relative magnetic permeablity = 1. • Goal: Prove with a comparison study.

  10. Merged Volumes Outer-most Lamination Arch Segment with Air Enclosure: Solid Model

  11. Conformal Mesh: Nodes shared at Interface (perfect magnetic coupling) Outer-most Lamination Arch Segment with Air Enclosure: Mesh

  12. Arch Segment w/ Air Magnetostatic Model Results: Current Density (A/m^2)

  13. Arch Segment w/ Air Magnetostatic Model Results: Joule Heat

  14. SOLID236: LINE EDGE METHOD Arch Segment w/ Air Magnetostatic Model Results: Magnetic Flux (Metal +Air)

  15. Arch Segment w/ Air Magnetostatic Model Results: Magnetic Flux (Metal Only)

  16. Arch Segment w/ Air Magnetostatic Model Results: Current Density

  17. Arch Segment w/ Air Magnetostatic Model Results: Lorentz Forces (N)

  18. Arch Segment w/ Air Magnetostatic Model Results: Magnetic Flux (Metal Only)

  19. Arch Segment w/ Air Magnetostatic Model Results: Lorentz Forces (N)

  20. SOLID186 Stress and reaction force results closely agree with hand-calculated values. Arch Segment w/ Air Static Structural Model Results: von Mises Stress (Pa)

  21. SOLID236 LINE EDGE METHOD Arch Segment _No Air - Magnetostatic Model Results: Magnetic Flux (Tesla)

  22. Arch Segment _No Air - Magnetostatic Model Results: Current Density (A/m^2)

  23. Arch Segment _No Air - Magnetostatic Model Results: Lorentz forces (N)

  24. Arch Segment _No Air - Magnetostatic Model Results: Magnetic Flux (Tesla)

  25. Arch Segment _No Air - Magnetostatic Model Results: Lorentz Forces (N)

  26. SOLID186 Stress and reaction force results closely agree with hand-calculated values. Arch Segment _ No Air - Static Structural Model Results: von Mises Stress (Pa)

  27. Conclusion • SOLID117 results are not valid, but SOLID236 results using line edge method agree with hand-calculated classic solution values. • No difference between results with air enclosure modeled and without. Note: Modeling without air enclosure is valid only for cases where all materials have a relative magnetic permeability = 1.

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