Dear colleagues,

With your support and active participation, the Topology Optimization Webinar, or TOP Webinar, has been running for almost two years. The latest webinar marked our 20^th session. The webinar series was intended as an alternative platform for knowledge exchange during the COVID pandemic. Now that the conferences are coming back, we think it is a moment to reflect on the past and to plan the next phase of the TOP Webinar. For this purpose, we have created an online questionnaire.

https://forms.office.com/r/QYZNK0k01G

We’d like to ask you to fill the questionnaire. It is anonymous, and shall take just a few minutes.

Your feedback is extremely valuable. Thank you in advance for your feedback.

Best regards,
Jun Wu, Matthijs Langelaar, Fred van Keulen, Niels Aage, Ole Sigmund
www.top-webinar.org

We’re pleased to announce the program of a special session: Future of Scientific and Engineering Computing in Research Community and Industry. It is scheduled for February 24^th, at CET 16:00 (7:00 Los Angeles, 10:00 New York, 16:00 Paris, 22:00 Beijing, 24:00 Sydney).

Zoom link (no registration required): https://dtudk.zoom.us/j/61728828736?pwd=dHNlVmRTZUR3Sm8rN0cvelIrNzRmZz09
YouTube link: https://www.youtube.com/channel/UCfknafkFQBuTOtHJH8I4qLQ/live

This special session is kindly organized by Prof. H. Alicia Kim and Dr. Jaeyub Hyun, from UC San Diego.

Program
1 Building Software Communities. Dr Daniel Katz (National Center for Supercomputing Applications)
2 Please Steal My Research: I’ll tell you anything you want to know. Dr Justin Gray (NASA Glenn)
3 Open-discussion on open-source/software/benchmarking in topology optimization

More information
1 Building Software Communities. Dr Daniel Katz (National Center for Supercomputing Applications)
Abstract: Research disciplines typically use software as one of their research methods, and develop (and ideally share) software during the research process. This talk will discuss efforts in different communities to improve the software used by those communities, which can include topics like sharing work on commonly used software, standardizing interfaces, raising the recognition of software developers. Such work has been occurring in multiple communities, and this talk will look at common elements across these communities, some of which could be applied to the topology optimization community.
Bio: Daniel S. Katz is Chief Scientist at the National Center for Supercomputing Applications (NCSA), and Research Associate Professor in Computer Science, Electrical and Computer Engineering, and the School of Information Sciences (iSchool) at the University of Illinois Urbana-Champaign. His interest is in the development and use of advanced cyberinfrastructure to solve challenging problems at multiple scales. His technical research interests are in applications, algorithms, fault tolerance, and programming in parallel and distributed computing, including HPC, Grid, Cloud, etc. He is also interested in policy issues, including citation and credit mechanisms and practices associated with software and data, organization and community practices for collaboration, and career paths for computing researchers. He is a founding editor and current Associate Editor-in-Chief of the Journal of Open Source Software, and co-founded the US Research Software Engineer Association (US-RSE) and the Research Software Alliance (ReSA).

2 Please Steal My Research: I’ll tell you anything you want to know. Dr Justin Gray (NASA Glenn)
Abstract: If you write software as part of our research then you may have considered releasing it as open source. It’s a good way to build collaborations and increase the impact of your work, but it also gives others the chance to see what your doing and  potentially beat you to the next innovation. In other words, someone might effectively steal your work! So open-source can sometimes be a bit of a double-edged sword. However, there are ways to make it work. It is possible to share your work as you develop it, have people adopt your code, and still get the credit you deserve. NASA’s OpenMDAO research does all our development out in the open, on a public repository. We’ve had other researchers collaborate on the work, and borrow from it, and criticize it. This talk covers the OpenMDAO open-source development philosophy and how it has been a key to the success of the project.
Bio: Justin Gray has worked at NASA Glenn for 18 years, serving as a systems analyst and design optimization expert. He has led the development of NASA’s OpenMDAO framework, an open-source optimization platform, since 2010. He’s actively contributed to 5 different open source engineering design codes, and generally makes a habit of doing his research out in the open for everyone to see.

We are pleased to announce the program of the 19th TOP Webinar. It is scheduled for 25th January, CET (UTC+1:00) 15:00-16:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Host: Junji Kato (Nagoya University, Japan)

1 – Shintaro Yamasaki (Osaka University, Japan)
Data-driven topology design using a deep generative model
Yamasaki, S., Yaji, K. & Fujita, K. Data-driven topology design using a deep generative model. Struct Multidisc Optim 64, 1401–1420 (2021).
https://doi.org/10.1007/s00158-021-02926-y

2 – Bin Niu (Dalian University of Technology, China)
Bin Niu, Eddie Wadbro, Multiscale design of coated structures with periodic uniform infill for vibration suppression, Computers & Structures, Volume 255, 2021, 106622,
https://doi.org/10.1016/j.compstruc.2021.106622

3 – Tobias Barbier (KU Leuven, Belgium)
Barbier, T, Shakour, E, Sigmund, O, Lombaert, G, Schevenels, M. Topology optimization of damage-resistant structures with a predefined load-bearing capacity. Int J Numer Methods Eng. 2021; 1- 32.
https://doi.org/10.1002/nme.6891

4 – Xiaoping Qian (University of Wisconsin-Madison, USA)
Xiaoping Qian, On-the-fly dual reduction for time-dependent topology optimization, Journal of Computational Physics, 2021, 110917,
https://doi.org/10.1016/j.jcp.2021.110917

5 – Emad Shakour (Johannes Kepler University, Austria) and Oded Amir (Technion, Israel)
Emad Shakour and Oded Amir, Stress constrained topology optimization with precise and explicit geometric boundaries, Struct. Multidisc. Opt. (2021) accepted

We are pleased to announce the program of the 18th TOP Webinar, a thematic session on “Topology Optimization for Wave Propagation Problems”. It is scheduled for 16th December, CET (UTC+1:00) 15:00-16:30*. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

*Please note this time in your time zone might be different from previous TOP Webinars. We have changed since November due to the transition from European daylight-saving time, and that we shift it by one hour to facilitate a large audience.

Host: Rasmus Ellebæk Christiansen (DTU Denmark)

1 – Eddie Wadbro (Karlstad University, Sweden)
Bokhari, A. H., Mousavi, A., Niu, B., & Wadbro, E. “Topology optimization of an acoustic diode?.” Structural and Multidisciplinary Optimization, 63(6), (2021): 2739-2749.
https://doi.org/10.1007/s00158-020-02832-9

2 – Yuki Noguchi (University of Tokyo, Japan)
Noguchi, Y., Yamada, T. “Topology optimization for acoustic structures considering viscous and thermal boundary layers using a sequential linearized Navier-Stokes model”, (2021), arXiv:2108.06116 [cs.CE]
https://arxiv.org/abs/2108.06116

3 – Wenjie Yao (Massachusetts Institute of Technology, USA)
Yao, W., Verdugo, F., Christiansen, R. E., Johnson, S. G. “Trace formulation for photonic inverse design with incoherent sources.”, (2021), arXiv:2111.13046 [physics.optics]
https://arxiv.org/abs/2111.13046

4 – Alec Hammond (Georgia Institute of Technology, USA)
Hammond, A. M., Oskooi, A., Johnson, S. G., & Ralph, S. E. “Photonic topology optimization with semiconductor-foundry design-rule constraints.” Optics Express, 29(15), (2021), 23916-23938.
https://doi.org/10.1364/OE.431188

5 – Oliver Giraldo-Londoño (University of Missouri, USA)
Giraldo-Londoño, O., Aguiló, M. A., Paulino, G. H. “Local stress constraints in topology optimization of structures subjected to arbitrary dynamic loads: a stress aggregation-free approach.”, Struct Multidisc Optim 64, (2021), 3287-3309.
https://doi.org/10.1007/s00158-021-02954-8
Giraldo-Londoño, O., Paulino, G. H. “PolyDyna: a Matlab implementation for topology optimization of structures subjected to dynamic loads”, Struct Multidisc Optim 64, (2021), 957-990.
https://doi.org/10.1007/s00158-021-02859-6

We are pleased to announce the program of the 17th TOP Webinar, a thematic session on “Topology Optimization for Inelastic Design”. It is scheduled for 30th November, CET (UTC+1:00) 15:00-16:30*. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

*Please note this time in your time zone might be different from previous TOP Webinars, due to the transition from European daylight-saving time, and that we shift it by one hour to facilitate a large audience.

Program

Host: Natasha Vermaak (Lehigh University USA)

1 – Iwona Jasiuk (University of Illinois at Urbana-Champaign USA)

Abueidda, Diab W., Ziliang Kang, Seid Koric, Kai A. James, and Iwona M. Jasiuk. “Topology optimization for three‐dimensional elastoplastic architected materials using a path‐dependent adjoint method.” International Journal for Numerical Methods in Engineering 122, no. 8 (2021): 1889-1910.
https://doi.org/10.1002/nme.6604

2 – Piotr Tauzowski (Institute of Fundamental Technological Research of the Polish Academy of Sciences, POLAND)

Tauzowski, P., Blachowski, B. and Lógó, J., 2021. Topology optimization of elasto-plastic structures under reliability constraints: A first order approach. Computers & Structures, 243, p.106406.
https://doi.org/10.1016/j.compstruc.2020.106406

3 – Mathilde Boissier (Ecole Polytechnique, FRANCE)

Boissier, M., Deaton, J.D., Beran, P.A. and Vermaak, N., 2021. Elastoplastic topology optimization of cyclically loaded structures via direct methods for shakedown. Structural and Multidisciplinary Optimization, pp.1-29.
https://doi.org/10.1007/s00158-021-02875-6

4 – Haim Waisman (Columbia University USA)

Russ, J.B. and Waisman, H., 2021. A novel elastoplastic topology optimization formulation for enhanced failure resistance via local ductile failure constraints and linear buckling analysis. Computer Methods in Applied Mechanics and Engineering, 373, p.113478.
https://doi.org/10.1016/j.cma.2020.113478

5 – Mathias Wallin (Lund University/LTH, SWEDEN)

Ivarsson, N., Wallin, M., Amir, O. and Tortorelli, D.A., 2021. Plastic work constrained elasto‐plastic topology optimization. International Journal for Numerical Methods in Engineering. 1-24
https://doi.org/10.1002/nme.6706

We are pleased to announce the program of the 16th TOP Webinar, which is scheduled for 28th October, CEST 16:00-17:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Program

Host: Yi Min ‘Mike’ Xie (RMIT University)

1 – Simon Thomas (The University of Sydney)

Simon Thomas, Qing Li & Grant Steven. ‘Finite periodic topology optimization with oriented unit-cells’. Structural and Multidisciplinary Optimization, 2021.
https://doi.org/10.1007/s00158-021-03045-4

2 – Benedikt Kriegesmann (Hamburg University of Technology)

Micah Kranz, Julian K. Lüdeker & Benedikt Kriegesmann. ‘An empirical study on stress-based fail-safe topology optimization and multiple load path design’. Structural and Multidisciplinary Optimization, 2021.
https://doi.org/10.1007/s00158-021-02969-1

3 – Matthew Gilbert (The University of Sheffield)

Helen E. Fairclough, Linwei He, Thomas J. Pritchard & Matthew Gilbert. ‘LayOpt: an educational web-app for truss layout optimization’. Structural and Multidisciplinary Optimization, 2021.
https://doi.org/10.1007/s00158-021-03009-8

4 – Jiaming Ma (RMIT University)

Jiaming Ma, Zi-Long Zhao, Sen Lin & Yi Min Xie. ‘Topology of leaf veins: Experimental observation and computational morphogenesis’. Journal of the Mechanical Behavior of Biomedical Materials, Vol. 123, 2021, 104788.
https://doi.org/10.1016/j.jmbbm.2021.104788

5 – Yi Xia (Delft University of Technology)

Yi Xia, Matthijs Langelaar & Max A.N. Hendriks. ‘Optimization-based three-dimensional strut-and-tie model generation for reinforced concrete’. Computer-Aided Civil and Infrastructure Engineering, Vol. 36, 2021, 526– 543.
https://doi.org/10.1111/mice.12614

We are pleased to announce the program of the 15th TOP Webinar, which is scheduled for 28th September, CEST 16:00-17:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Program
Host:
Mattias Schevenels (KU Leuven, Belgium)

1 – Jamie Guest (Johns Hopkins University, Baltimore, USA)
R. Behrou, R. Lotfi, J.V. Carstensen, F. Ferrari, and J.K. Guest. Revisiting element removal for density-based structural topology optimization with reintroduction by Heaviside projection. Computer Methods in Applied Mechanics and Engineering, 380:113799, 2021. https://doi.org/10.1016/j.cma.2021.113799

2 – Patrick Farrell (Oxford University, UK)
I.P.A. Papadopoulos, P.E. Farrell, and T.M. Surowiec. Computing multiple solutions of topology optimization problems. SIAM Journal on Scientific Computing, 43(3):A1555-A1582, 2021. https://doi.org/10.1137/20M1326209

3 – Gengdong Cheng and Yuan Liang (Dalian University of Technology, China)
Y. Liang and G. Cheng. Further elaborations on topology optimization via sequential integer programming and Canonical relaxation algorithm and 128-line MATLAB code. Structural and Multidisciplinary Optimization, 61(1):411-431, 2020. https://doi.org/10.1007/s00158-019-02396-3
Y. Liang, K. Sun, and G. Cheng. Discrete variable topology optimization for compliant mechanism design via Sequential Approximate Integer Programming with Trust Region (SAIP-TR). Structural and Multidisciplinary Optimization, 62(6):2851-2879, 2020. https://doi.org/10.1007/s00158-020-02693-2
X.Y. Yan, Y. Liang, and G. Cheng. Discrete variable topology optimization for simplified convective heat transfer via sequential approximate integer programming with trust-region. International Journal for Numerical Methods in Engineering, 2021. Published online. https://doi.org/10.1002/nme.6775

4 – Pierre Duysinx and Eduardo Fernandez (University of Liège, Belgium)
D. Trillet, P. Duysinx, and E.F. Fernández Sanchez. Analytical relationships for imposing minimum length scale in the robust topology optimization formulation. Structural and Multidisciplinary Optimization, 2021. Published online. https://doi.org/10.1007/s00158-021-02998-w
E. Fernández, C. Ayas, M. Langelaar, and P. Duysinx. Topology optimisation for large-scale additive manufacturing: generating designs tailored to the deposition nozzle size. Virtual and Physical Prototyping, 16(2):196-220, 2021. https://doi.org/10.1080/17452759.2021.1914893

5 – Vittoria Laghi (University of Bologna, Italy)
M. Bruggi, V. Laghi, and T. Trombetti. Simultaneous design of the topology and the build orientation of wire-and-arc additively manufactured structural elements. Computers & Structures, 242:106370, 2021. https://doi.org/10.1016/j.cma.2021.113799

Hope you are having a nice summer. After a great WCSMO congress and a summer break, we resume the TOP Webinar series.

We are pleased to announce the program of the 14th TOP Webinar, which is scheduled for 26th August, CEST 16:00-17:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Program

Host: Josephine V Carstensen (Massachusetts Institute of Technology)

1 – Mingdong Zhou (Shanghai Jiao Tong University)
Yichang Liu, Mingdong Zhou, Chuang Wei & Zhongqin Lin. “Topology optimization of self-supporting infill structures”. Struct Multidisc Optim 63, 2289–2304 (2021). 
https://doi.org/10.1007/s00158-020-02805-y

2 – Emily Sanders (Georgia Institute of Technology)
Sanders, E. D., Pereira, A., & Paulino, G. H. (2021). “Optimal and continuous multilattice embedding”. Science Advances, 7(16), eabf4838.
https://doi.org/10.1126/sciadv.abf4838

3 – Shangqin Yuan (Northwestern Polytechnical University)
Shaoying Li, Shangqin Yuan, Jihong Zhu, Weihong Zhang, Han Zhang & Jiang Li. “Multidisciplinary topology optimization incorporating process-structure-property-performance relationship of additive manufacturing”. Struct Multidisc Optim 63, 2141–2157 (2021).
https://doi.org/10.1007/s00158-021-02856-9

4 – Jorge Barrera (University of Colorado at Boulder)
Barrera, Jorge L., Markus J. Geiss, and Kurt Maute. “Hole seeding in level set topology optimization via density fields”. Structural and Multidisciplinary Optimization 61.4 (2020): 1319-1343.
https://doi.org/10.1007/s00158-019-02480-8

5 – Fengwen Wang (Technical University of Denmark)
Wang, Fengwen, and Ole Sigmund. “3D architected isotropic materials with tunable stiffness and buckling strength”. Journal of the Mechanics and Physics of Solids 152 (2021): 104415.
https://doi.org/10.1016/j.jmps.2021.104415

We are looking forward to meeting you online soon!

We are pleased to announce the program of the 13th TOP Webinar, which is scheduled for 27th May, CEST 16:00-17:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Program

Host:
Jun Yan (Dalian University of Technology, China)
Bin Niu (Dalian University of Technology, China)

1 – Gore Lukas Bluhm, Technical University of Denmark, Denmark
Gore Lukas Bluhm, Ole Sigmund, Konstantinos Poulios. Internal contact modeling for finite strain topology optimization, Computational Mechanics, 67, 1099–1114, 2021.

2 – Junji Kato, Nagoya University, Japan
T Nishino, J Kato. Robust topology optimization based on finite strain considering uncertain loading conditions. International Journal for Numerical Methods in Engineering, 122:1427–1455, 2021.

3 – X. Shelly Zhang, University of Illinois at Urbana Champaign, USA
Xiaojia Shelly Zhang, HengChi, Glaucio H.Paulino. Adaptive multi-material topology optimization with hyperelastic materials under large deformations: A virtual element approach, Computer Methods in Applied Mechanics and Engineering, 370: 112976, 2020

4 – Emiel van de Ven, Delft University of Technology, The Netherlands
van de Ven, E., Ayas, C., Langelaar, M., Maas, R., van Keulen, F. Accessibility of support structures in topology optimization for additive manufacturing，International Journal for Numerical Methods in Engineering, 122(8): 2038-2056，2021

5 – Zunyi Duan, Northwestern Polytechnical University, China
Zunyi Duan*, Yongsu Jung, Jun Yan, Ikjin Lee*. Reliability-based multi-scale design optimization of composite frames considering structural compliance and manufacturing constraints. Structural and Multidisciplinary Optimization, 61(2):2401-2421, 2020

We are pleased to announce the program of the 12th TOP Webinar, which is scheduled for 29th April, Thursday, CEST*(UTC+2:00) 16:00-17:30. Please register at this link. This event will also be livestreamed on YouTube with this permanent link.

Considering manufacturing aspects at an early design optimization stage is important to ensure that obtained designs can be realized. Within topology optimization, design for manufacturing therefore forms an active field of study, further stimulated by (but not limited to) technological developments in additive manufacturing. In this Thematic Session of the TOP Webinar Series, recent research on various aspects of topology optimization for manufacturing will be presented and discussed. We look forward to see you there!

* Note that this time in your time zone might be different from previous TOP Webinars, due to the transition from European daylight-saving time. For reference, CEST 16:00 on April 29^th is 7:00 Los Angeles, 10:00 New York, 22:00 Beijing, 0:00 Sydney.

Host: Matthijs Langelaar (Delft University of Technology)

Schedule:

1.      “Simultaneous topology and fastener layout optimization of assemblies considering joint failure”, Olaf Ambrozkiewicz and Benedikt Kriegesmann.
Based on International Journal for Numerical Methods in Engineering 122, no. 1 (2021): 294-319, https://dx.doi.org/10.1002/nme.6538

2.       “Topology optimization with discrete geometric components made of composite materials”, Hollis Smith and Julián A. Norato.
Based on Computer Methods in Applied Mechanics and Engineering 376 (2021): 113582,
https://doi.org/10.1016/j.cma.2020.113582

3.      “Design of spatially-varying orthotropic infill structures using multiscale topology optimization and explicit de-homogenization”, Jaewook Lee, Chiyoung Kwon, Jeonghoon Yoo, Seungjae Min, Tsuyoshi Nomura, and Ercan M. Dede.
Based on Additive Manufacturing (2021): 101920, https://doi.org/10.1016/j.addma.2021.101920

4.      “Concurrent shape optimization of the part and scanning path for additive manufacturing”, Mathilde Boissier, Grégoire Allaire, and Christophe Tournier.
Based on https://hal.archives-ouvertes.fr/hal-03124075/document (Preprint, 2021)

5.      “Additive manufacturing oriented topology optimization of structures with self-supported enclosed voids”, Luo, Yunfeng, Ole Sigmund, Quhao Li, and Shutian Liu.
Based on Computer Methods in Applied Mechanics and Engineering 372 (2020): 113385.
https://doi.org/10.1016/j.cma.2020.113385

We are looking forward to meeting you online soon!