REMS Blog

03/11/18
Saturday 3rd November – Arriving in Taiwan
When I booked my ticket for the 9th International Conference on Scour and Erosion (ICSE 2018), I didn’t anticipate exploring the Tonghua night market in Taipei trying to decide which street food to eat, while struggling with sleep deprivation! It’s a Saturday night, and I’ve only been in Taipei for a few hours following a long journey from the UK.

Photo: Taipei 101 greets me when I leave the metro station

Sunday 4th November – Exploring Taipei and conference registration
On Sunday morning I’ve actually managed to catch up on sleep fairly well, with the help of a nap I had on Saturday afternoon. I have some excellent noodle soup for lunch on the recommendation of my Taiwanese colleague on the REMS course at Oxford, then explore the local area around Taipei 101 where there are lots of shops, and I found a big group of musicians in one of the squares demonstrating traditional drumming.
In the afternoon I make my way to the Taipei International Convention Center to register for the conference, where I bump into Richard Whitehouse – my Industrial Supervisor at HR Wallingford and chair of the Scour and Erosion technical committee (ISSMGE TC213). Later in the afternoon I went back to my room to practice my presentation a few times and to work out the narrative of my talk. For this conference I have 12 minutes to talk, but the first practice took me around 15 minutes! I really don’t want to run out of time on the day, so I ended up tweaking my slides and focusing the content of my talk.

Photo: Small-scale renewable energy in Taipei, combining solar with a vertical-axis wind turbine

Monday 5th November – The conference begins
Today is the first day of the conference. The day starts with an opening ceremony and some introductions and welcomes. This is followed by the first keynote presentation and a coffee break. The rest of the day is made up of presentations on a range of scour applications from rivers and dams, through to offshore subjects such as turbidity currents and renewable energy. At this conference the presentations are in three parallel sessions, so there is an exercise in looking through the programme and proceedings to decide which talks to attend. The day is broken up with coffee breaks and lunch, with plenty of time for discussions.
Conferences like this are a fantastic opportunity to meet up with a diverse range of specialists, and I meet people here that I remember from the last ICSE held at Oxford in 2016 but also PhD students, professors, and consultants that are also working on offshore wind projects. Of course in the evening there are more networking opportunities over dinner and then over a few drinks at a bar – it is only at these very specialised conferences that you get the chance to meet with such a range of people to freely share ideas and even to gain new inspiration for your own research.
Tuesday 6th November – Time to give my presentation
Tuesday starts with another two keynote presentations. My talk is in the last session of the day, but with only one other parallel session. The audience was around 100 people. I’ve presented at a similar conference in London back in July, as well as at the REMS conferences over recent years, so I’ve learned to be better prepared and as a result have less nerves before giving a talk than a few years ago. Part way through my talk a “5 minutes left” sign is held up, and by the end of my talk I’ve managed to keep to time and communicate the main messages I wanted to get across. I answer four questions from the audience then more people come to speak to me after the session for further discussions – it is rewarding and encouraging that my talk has generated so much interest.
Wednesday 7th November – The conference formally closes
Wednesday is the last day of presentations, the day follows the same format as the previous two – only today I no longer need to worry about my presentation. The day ends with closing speeches and the conference dinner on the 33rd floor of the Taipei World Trade Center. We are treated to a display of traditional Taiwanese dances, and a delicious range of Taiwanese food.

Photo: Richard Whitehouse and myself with Taipei 101 at night

Thursday 8th November – Visiting a dam and a bridge on the Dajia river
On Thursday, the last day of the conference, an industrial visit is planned. The conference attendees take a coach out of Taipei for 2 hours to the Dajia River on the western side of Taiwan. Our first stop of the day is the Shigang dam, which was badly damaged by a landslide during the 921 earthquake in 1999. The earthquake was magnitude 7.6, and the fault runs right underneath the dam itself. Impressively emergency repairs were rapidly performed before the typhoon season in 2000 but the situation remains challenging due to progressing river erosion and reliance on the reservoir as a water source.
In the afternoon we visit the Hualiang steel bridge further downstream – a former railway bridge now just used for pedestrians and cyclists. We are taken down to the river bed, where the bridge foundations are being badly undermined by scour. The scour here is due to a combination of the steep gradient of the river, and the weathered sandstone riverbed which crumbles easily to sand particles and can be broken up by hand into smaller blocks. The day of field visits has illustrated the significant engineering challenges for engineering structures in Taiwan due to combinations of the local geology, climate, as well as potentials for earthquake damage – and demonstrated the interest of the scour and erosion scientific community to organise this conference here.
The 10th ICSE will be in Washington DC in 2020 by which time I will (hopefully) be a REMS alumni, but I hope to stay in touch with my old and new friends in this international scientific community. Before I leave I’m having a long weekend in Taipei to see some more sights and take in some culture. Maybe I’ll take a trip up Taipei 101 to see the famous 660-tonne tuned mass damper…

Photo: Hualiang steel bridge foundations undermined by scour
Russell Mayall
24/07/18

I joined the 1st cohort of the Renewable Energy Marine Structures (REMS) Centre for Doctoral Training (CDT) in 2014. At that time there was a feeling of reserved optimism in the developing European offshore wind sector that the CAPEX and OPEX price would incrementally reduce over the subsequent years and as a result the industry would grow at a steady pace. Four years on, in 2018, and now offshore wind is a booming global industry, with tumbling costs resulting in zero-subsidy offshore wind farms becoming a reality.

As part of REMS, I am undertaking a DEng at the University of Oxford, while working at Fugro GB Marine Limited within the GeoConsultancy service line. My aim is to develop practical constitutive models for the numerical modelling of offshore foundations. I selected this as my topic area for research as, based on my time working as a geotechnical consultant on finite element analysis (FEA) projects, it was clear that there was a large gap between industry and academia. I felt the proposed DEng format within a CDT offered the perfect environment for this research to attempt to bridge the gap. Being part of the REMS CDT offers the opportunity to work at the interface between industry and academia in a highly dynamic exciting industry. A DEng is similar to a traditional DPhil (or PhD) in many ways, with the main difference being a practical industry tilt to the research and the opportunity to work on live industry projects. Some components of my DEng have involved development work for live offshore wind projects and others have involved more long term academic focused developments. In my opinion, this mix of academia and industry research offers a unique opportunity for short to medium term innovation within the industry. During the programme I have had many unique opportunities; including, spending 2 months at the University of Western Australia (UWA); undertaking a wide range of renewable energy focused doctorate level technical taught modules; applying my research on a number of commercial offshore wind projects; presenting at conferences and more academic focused research, steered by highly respected Professors from the University of Oxford.

A recent week of work for me in March 2018 within REMS is shown below which I think highlights the diverse opportunities available to me while undertaking my DEng within an engineering consultancy.

Monday:
My week starts at the Fugro office in Wallingford where, first thing in the morning, I attend a weekly design meeting for an offshore wind monopile foundation design project I have been working on. The consultancy project has been ongoing for 6 months and we are reaching the final stages. The project, which forms a section of my DEng portfolio, has been very challenging and has involved development of a number of new models and scripts to run and post-process a large number of 3D FEA. As part of the project we have some stress path tests running in the Fugro laboratory in Wallingford that are to be used for model calibration, so I spend some of my day checking the results completed so far to ensure they are as expected. The rest of my day is primarily spent running verification analyses for a new constitutive model I have implemented. I have been working on the model, termed the MSurf-ACE model, for many months with my supervisors, Prof. Chris Martin and Prof. Harvey Burd from the University of Oxford and Dr. Mike Rattley from Fugro.


Figure 1: Visiting the Fugro laboratory to inspect some ongoing stress path tests

Tuesday:
I am working from my office in the University of Oxford today where I am continuing to run verification analyses for the MSurf-ACE model. I manage to drag myself from the computer to take a break at lunch time and attend the weekly civil engineering seminar in the university.

Wednesday:
I spend Wednesday putting the finishing touches to slides I have prepared for a presentation I am to give in Holland for the Royal Netherlands Society of Engineers (KIVI). The presentation includes work from my research and additional recent innovations from the wider Fugro group.

Thursday:
I arrive in Holland and spend most of the day meeting colleagues at the Fugro office in Nootdorp to discuss innovation ideas across the Fugro group. In the evening I give my KIVI lecture titled: Foundation Optimisation for Ever Larger Turbines: Geotechnical Perspective. The lecture was attended by over 80 engineers and seemed to be well received, with several very interesting questions from the audience. I also had the opportunity to relax at the social event after the presentation and have some very interesting technical discussions with other engineers from the offshore industry.


Figure 2: Presentation at the KIVI lecture

Friday:
I arrive back in the UK early morning and go to the office to start preparing a draft journal paper to describe the new MSurf-ACE model I have been developing. I attend a meeting in the afternoon with my supervisors to discuss the structure of the planned journal paper and some recent results I have produced. After this I head for some much-needed rest!


Figure 3: Presenting results at a supervisory meeting
Scott Whyte
16/01/18

It is wise to start by welcoming the new cohort 2021 to the REMS centre and wish them loads of fun and success in their future researches. The week of the 18th of September was a particularly eventful for the REMS students. It was a week of conferences where both the annual REMS and the EAWE conferences were organised successively at Cranfield University. The sharing of knowledge and passions was demonstrated through various presentations which enabled a unique network to be established between both researchers and industry representatives. That said two REMS students had to leave the conference quite briskly as a result of their deployment for a field experiment. Those two students are Paul Causon and Waseem Khodabux who in the scope of their doctorate are analysing the marine growth effects and pitting corrosion on wind turbine foundation.

The weather displayed a certain kindness on those autumnal days of the 19th and 20th of September 2017. When such a small window of opportunity appears, it does make sense to take a leap. The van was booked waiting for the keys to be collected at the main reception for the adventure for our two protagonists, Waseem and Paul to begin. The destination was Bridlington also known as the lobster capital of Britain and which eventually has also transformed into a major port for offshore wind related projects due to its proximity to various windfarms on the east coast. In that area, quite a few windfarms going through different technological iterations from Round 1 to 3 have been installed. The colossal Dogger Bank also forms part of that cluster of offshore structures populating the seas around that region.

The anchors, plates, frames, ropes, cable ties and spacer were all loaded and it was time to hit the road. It turned out to be quite an impressive experience where Paul was describing the various hurdles that would have to be overcome once the pair were on the deployment boat. During the whole journey to Bridlington a plan was devised. When they reached the hotel they smiled. It had a Disco ball and it seemed the more mature generation were out partying in droves in the hotel. Unfortunately Paul and Waseem could not join the fun as there was work to do; instead they hit the road again to Tesco to gather some essentials for trial the next day.

It was already late by the time they returned to the hotel. They jumped into their respective beds and got up early at around 4am and directed themselves to the quay. The boat was a fishing one, sporting a crane of 500kgs lift capacity at the rear of it. They were welcomed by a small but experienced crew of researchers and the captain, loaded the experiment stuff and had a safety briefing by the captain of the boat.


Paul busy assembling the coupons and fine tuning the tying

The pair set off and as soon as they got familiar with the rocking motion of the waves set out to assemble the experiment. It involved the delicate task of tying the frames to the coupons and the buoys. A lot of rope cutting and cable ties tightening were needed but finally the task was complete. It was time to deploy the experiment. Moment of truth. The crane buzzed into life and the hook was hoisted down. Paul and Waseem retreated to the safety zone. There was the firm grip of the hook to the anchor and the operator manipulated the levers and soon the whole assembly was on the move. The anchor was released in the water first and seconds later, the whole assembly was sinking in the depth of the ocean. This was it, an experience to remember and cherish for a very long time. They cannot wait to go back for the full deployment but before then have to wait for a weather window.


Anchors going in the water Waseem posing

P.S. The trial assembly survived two storms and is still going strong.

Waseem Khodabux, Paul Causon
21/06/17
Offshore wind energy remains an untapped power resource in the United States of America considering the strong offshore wind power potential (of approx.. 4,150 GW according to NREL) along the US coasts, where major population centres are located. Due to slow wind speeds in regions with shallow waters located along the Gulf Coast and mid-Atlantic Coast, proven technology which is currently widely deployed in European shallow waters cannot be directly applied in the US. In contrary, US has significant potential in deep-water locations where floating offshore wind turbine structures are required.

Dr Todd Griffith from Sandia National Laboratories gave a prestige lecture on the 21st of April in Cranfield University providing an overview of the research projects currently taking place at Sandia National Laboratories addressing the unique conditions of the US offshore environment. Sandia is a US Federally Funded Research and Development Centre with the mission to deliver essential science and technology to address National Security challenges.


Figure 1 Snapshots from the Prestige Lecture given by Dr Todd Griffith from Sandia National Laboratories

Dr Griffith presented projects conducted by the Wind Energy Technologies Department of Sandia National Laboratories, covering:
  • Large-scale hurricane resilient wind turbine blade designs
  • Novel floating vertical axis wind turbines for deep-water siting
  • Offshore wind farm code development, and
  • Structural health monitoring & prognostics management systems.

Sandia has developed a series of detailed 100-meter blade reference models that are available to designers and researchers for design studies and cost analysis; while turbine models reaching 50 MW rated capacity using segmented ultralight morphing rotors based on bio-inspired load alignment (e.g. palm tree) have also been designed. The rotor’s load alignment reduces the required mass for blade stiffening, and makes the turbines more resistant to storms, while their segmented design allows the massive blades to be manufactured in segments which reduces the transportation and manufacturing costs.


Figure 2 Load alignment configuration. Source: Dr Todd Griffith’s presentation


Further research studies conducted at Sandia National Laboratories involve: Hi-resolution modeling of floating wind turbines, wherein a state of the art eddy simulation code has been formulated in order to simulate atmospheric turbulence with wind farms in both land-based and offshore environments; structural health and prognostics management with a focus on damage detection and analysis of effects of damage (state of health and remaining life), and floating offshore vertical-axis wind turbines, among others.



Figure 3 Results for Floating 13.2 MW Turbine. Source: Dr Todd Griffith’s presentation


Sandia has developed 6 public domain designs, covering a range of different areas: power performance models, structural models, economic models, anchor and mooring design, PTO design, O&M / Installation, permitting & environment.
Conclusively, this is an exciting time for marine renewables with significant growth prospects within the next decade. However, while there is the necessary technical know-how and proven technology is already deployed in European waters, as we move further from shore and as extreme scale wind turbines start to be deployed, conventional designs will no longer be applicable. Hence, innovative solutions focusing on reducing technology risks and cost of energy (COE) adjusted to location specific conditions need to be invented for different marine hydro-kinetic technologies.

More information on Sandia’s activities may be found here: http://energy.sandia.gov/energy/renewable-energy/wind-power/offshore-wind/

Author - Anastasia Ioannou