HFSS 15 New Features - · PDF file© 2011 ANSYS, Inc. September 27, 2013 2 Faster Solvers...

© 2011 ANSYS, Inc. September 27, 2013

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HFSS 15 New Features


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Faster Solvers

Improved Broadband Frequency Sweeps

Improved Finite Antenna Array DDM Solver

HFSS 15 New Features in HPC


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Faster Solvers


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Matrix solving is typically the largest part of the HFSS process

Most memory and time, reflected in the Solver profile line

In HFSS 15 a new multi-core matrix solver is enabled with HPC

Faster Matrix Solver with ANSYS HPC

33% Faster with ANSYS HPC


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On ‘Tools/Options/HFSS Options..’ menu

‘Solver’ tab

Check ‘Use HPC licenses for multiprocessing and distributed frequency points’

How to Enable new HPC Matrix Solver


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Faster with HPC: Scalability

With larger matrix…

scalability continues

830k tetrahedra

5.3M matrix size

Improved direct matrix solver available with ANSYS HPC

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Speed (HPC)

Speed (MP)


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Faster DDM Solver

Improvements to DDM algorithm, increased scalability

Implementation of MPI for network interconnect

Model: Predator UAV antenna @ 900 MHz

265 m3 = 7155 λ3, across 60 compute cores

HFSS 14 HFSS 15

Adaptive passes 8 8

Tetrahedra 6,170,408 5,740,641

Matrix size 41.5M 38.9M

Total memory 255 GB 237 GB

Time 6:31:15 5:42:15 (+14%)


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DDM’s Improved Scalability

Better than linear

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Direct matrix Solve (HPC)

Direct Matrix Solve (MP)

DDM (HPC)

linear

Direct matrix solver


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HPC vs. MP performance

Studied a range of models to determine average performance with HPC

Faster and more scalable with HPC


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Progressive improvements: ~5X speed-up from v12 to v15

Model: 20 terminal backplane connector, DC to 20 GHz

80 core (8X10), matrix multiprocessing plus distributed frequency points

From Release to Release

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1.50

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From v12 to v15

Total Speed

Adaptive Mesh Speed

Sweep Speed

4.6X


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Improved Broadband Sweep Characterization


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Improvements in single frequency point extraction

Improvements in parallel frequency point extraction

Model: Package on Board. Large model with complex frequency response

Broadband Sweeps

HFSS 14 HFSS 15

Tetrahedra 867,629 (~0.01) 987,195 (~0.007)

Memory 28.7 GB 38.5 GB

8X1 (HPC 8) 72:50:53 (1X) 74:28:25 (0.98, 1)

8X4 (HPC 32) 25:04:40 (2.9X) 19:41:21 (3.7, 3.8)

8X16 (HPC 128) 8:50:08 (8X) 5:23:52 (12.6, 12.9)

From days to hours with ANSYS HPC


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Previous data: Slight differences in meshing

Eliminate with dependent solve setup

Using 8X4 (HPC 32) and 8X16 (HPC 128)

Broadband Sweeps, continued

HFSS 14 HFSS 15

Matrix solve time (8 cores) 19:34 14:25 (35% faster)

HPC 32 sweep efficiency 74% 98%

HPC 32 solution time 25:04:40 14:48:15 (70% faster)

HPC 128 sweep efficiency 52% 95%

HPC 128 solution time 08:50:08 03:50:14 (130% FASTER!)


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Finite Array 2.0


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Finite Array with DDM in HFSS 15

Assemble array from base element New to HFSS 15 -Array mask -Sparse array -Composite excitation Tapered, sparse patch array at


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Finite Array 2.0

View fields across entire array


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What is it? – An ‘arbitrary’ outline or

sparse layout for repeating antenna array

How to use it? 1.Define a unit cell for

antenna element

2.Right-click on ‘Model’ in design tree • ‘Create Array…’

3.On ‘General’ tab define outline size of array

4.Active cell tab defines a) Padded cells

b) Passive cells

Array Mask


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An iterative process (e.g. DDM) serially constructs solution for individual excitations

Many excitations, x1, x2, x3… xn extend simulation times

What if desired result is for one specific ‘excitation vector’ a1x1+a2x2+a3x3+…anxn

Antenna array at boresight, equal amplitude and phase

Example: 192 element tapered and sparse patch array

192 excitations: 05:34:48

Composite: 00:09:49

34X Faster!

Composite Excitations

HFSS 15 New Features - · PDF file© 2011 ANSYS, Inc. September 27, 2013 2 Faster Solvers...

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