using dummy objects and seeding to accelerate...
TRANSCRIPT
Ansoft Users Workshop 1
Daniel G. Swanson, Jr.R&D Manager
Forem USA37 South Hunt Road
Amesbury, MA 01913
Using Dummy Objects and Seeding to Accelerate Convergence in HFSS
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Ansoft Users Workshop 2
Introduction
• Past meshing strategy:
- Lambda Refine at λ /3
- Large number of adaptive passes: 10 to 20
- Not the most efficient mesh?
• New meshing strategy:
- Lambda Refine at λ /20 to λ /30
- Use dummy objects and seeding
- Limit number of adaptive passes: 6 to 8
• Coaxial resonators using eigen-solver
• Lowpass filters using driven solution
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Ansoft Users Workshop 3
FEM Meshing - Coaxial Resonator
0.2100.750
1.1201.260
Source f0 (GHz) Qu
Wang 1.87 5592FlexPDE 1.877 5608
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Ansoft Users Workshop 4
Two Possible Starting Points
Case 1:12 segments on post24 segments on cavityNo seeding or dummy objects
Case 2:12 segments on all objectsDummy object around postSeed dummy at 0.1, max of 2000
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Ansoft Users Workshop 5
Two More Starting Points
Case 3:12 segments on post and dummy24 segments on cavitySeed dummy at 0.1, max of 2000
Case 4:18 segments on all objectsTwo dummy objectsSeed inner dummy at 0.1, max of 4000
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Ansoft Users Workshop 6
Results for Case 1 and Case 212 segments on post, 24 segments on cavity, no seeding or dummy objects
Pass f0 (GHz) Qu No. of tets ∆f0 (%)1 1.67870 4600 192 N/A2 1.73039 4588 256 3.023 1.76209 1584 377 1.834 1.81827 4309 548 3.195 1.84973 4354 789 1.736 1.86460 4513 1094 0.80
Case 1
12 segments on all objects, dummy object around post, seed at 0.1, max of 2000
Pass f0 (GHz) Qu No. of tets ∆f0 (%)1 1.8647 5265 2390 N/A2 1.8822 5325 3161 0.9373 1.8863 5346 4240 0.2214 1.8887 5345 5738 0.1445 1.8899 5372 7793 0.4386 1.8904 5378 10644 0.089
Case 2
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Ansoft Users Workshop 7
Results for Case 3 and Case 412 segments on post and dummy, 24 segments on cavity, Seed at 0.1, max of 2000
Pass f0 (GHz) Qu No. of tets ∆f0 (%)1 1.8604 5398 2480 N/A2 1.8716 4762 3471 11.923 1.8759 5009 4841 4.714 1.8784 5304 6699 5.435 1.8796 5184 9234 2.356 1.8799 5430 12721 4.49
Case 3
18 segments on all objects, two dummy objects, seed inner at 0.1, max of 4000
Pass f0 (GHz) Qu No. of tets ∆f0 (%)1 1.86562 5452 4929 N/A2 1.87419 5449 6631 0.5123 1.87766 5447 8899 0.2244 1.87914 5437 12282 0.2715 1.87998 5447 16832 0.1346 1.88040 5452 21837 0.075
Case 4
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Ansoft Users Workshop 8
Coaxial Resonator Results
1.65
1.70
1.75
1.80
1.85
1.90
0 1 2 3 4 5 6 7
Case 1Case 2Case 3Case 4
Pass Number
Freq
uenc
y (G
Hz)
Resonant Frequency Convergence
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Ansoft Users Workshop 9
Coaxial Resonator Results
0123456789
101112
1 2 3 4 5 6 7
Case 1Case 2Case 3Case 4
Pass Number
∆f0 (%
)Delta in Resonant Frequency Convergence
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Ansoft Users Workshop 10
Summary for Coaxial Resonator
• Used default Lambda Refine (λ/3)
• Tracked convergence of complex frequency
• Eigen-solver may not estimate the starting point correctly
• User must use his or her knowledge of the problem
• Dummy objects and seeding force mesh in critical areas
- Minimum of 10 cells along resonator
- Seed high E-field regions in more complicated geometries
• Multiple dummies and seedings are certainly allowed
• Measured data or another trusted solution very valuable
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Ansoft Users Workshop 11
More Typical Coaxial Resonator Problem
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Ansoft Users Workshop 12
Coaxial Lowpass Filters
Ansoft HFSS V8.0
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Ansoft Users Workshop 13
Coaxial Lowpass Filters
.625 intypical
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Ansoft Users Workshop 14
Coaxial Step Convergence Study
1.00.9
0.1
Dimensions are inches
Dummy
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Ansoft Users Workshop 15
Coarse Lambda Refine - Add Dummy and Seeding
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1 2 3 4 5 6 7 8 9
No dummyWith dummy40% refine, with dummy40% refine, 0.1 seed in dummy
Lambda refine = 0.33λ
Pass Number
Cdi
s / C
ref
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Ansoft Users Workshop 16
Vary Lambda Refine Only
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1 2 3 4 5 6 7 8 9
0.330λ0.100λ0.050λ0.033λ
Default, no dummy
Pass Number
Cdi
s / C
ref
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Ansoft Users Workshop 17
Finer Lambda Refine - Add Dummy and Seeding
0.95
1.00
1.05
1.10
1.15
1 2 3 4 5 6 7 8 9
No dummyWith dummy40% refine, with dummy40% refine, 0.1 seed in dummy
Lambda refine = 0.033λ
Pass Number
Cdi
s / C
ref
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Ansoft Users Workshop 18
Delta S Behavior
0
0.002
0.004
0.006
0.008
0.010
1 2 3 4 5 6 7 8 9
No dummyWith dummy40% refine, with dummy40% refine, 0.1 seed in dummy
Lambda refine = 0.033λ
Pass Number
Del
ta S
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Ansoft Users Workshop 19
All The Tricks - Change Only Lambda Refine
0.99
1.00
1.01
1.02
1.03
1.04
1 2 3 4 5 6 7 8 9
(21,461)(12,063)
(6,540)
(3,581)
(25,268)(15,232)
(8,231)
(4,493)
0.033λ
0.33λ
40% refine, with dummy 0.1 seed in dummy (number of tets)
Pass Number
Cdi
s / C
ref
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Ansoft Users Workshop 20
FlexPDE Solution
2D Rotationally Symmetric
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Ansoft Users Workshop 21
FlexPDE Solution
0.98
0.99
1.00
1.01
1.02
0 1000 2000 3000 4000 5000 6000
Number of 2D Cells
Cdi
s / C
ref
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Ansoft Users Workshop 22
Summary for Coaxial Step Convergence Study
• Simple structure for convergence study
• Data available in the literature, 3D validation structure?
• Spatial wavelength important near the step
• More efficient strategy:
- Set Lambda Refine to λ /30
- Seed dummy near step - 10 samples across diameter
- Only 4 to 8 adaptive passes
• Delta S-parameters may not track absolute convergence
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Ansoft Users Workshop 23
Results Using Default Meshing Strategy
-50
-40
-30
-20
-10
0
1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 24
Results Using Dummy and Seeding
-50
-40
-30
-20
-10
0
1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 25
Coaxial Lowpass Filters - Example II
Detail
Ansoft HFSS V8.0
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Ansoft Users Workshop 26
Results Using Default Strategy
-50
-40
-30
-20
-10
0
0.5 1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 27
Dummy and Seeding - Missing Detail at Ends
-50
-40
-30
-20
-10
0
0.5 1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 28
End Termination Details
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Ansoft Users Workshop 29
Dummy and Seeding - With Termination Detail
-40
-30
-20
-10
0
0.5 1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 30
Tolerance Analysis - Add Air Gaps
-40
-30
-20
-10
0
0.5 1.0 1.5 2.0 2.5
MeasuredComputed
Frequency (GHz)
Inse
rtion
and
Ret
urn
Loss
(dB)
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Ansoft Users Workshop 31
Summary for Coaxial Lowpass Filters
• Study the key discontinuity first, then the complete filter
• Filters make auto mesh refinement more difficult
- High reflection at ports in stopband
- May not get good “connection” between input and output
- Mesher tends to concentrate on ports, ignores interior
• Seed and mesh near passband
• Refine mesh at low frequency with lambda based starting mesh
• Tolerance analysis required on second example
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