Exawind Project Demonstrates Blade-Resolved Simulation of NREL 5 MW Reference Wind Turbine

October 25, 2018

Oct. 25, 2018 — In 2017 wind generated 6.3% of the United States’s electricity, according to the US Energy Information Administration. If the nation can use its abundant wind resources to generate 30% of its electric power, the societal and economic impact will be profound. US energy security will be reinforced by the greater diversity in the energy supply. Cost-competitive electricity could be provided to key regions of the country, greenhouse-gas emissions reduced, and the quantity of water required for thermo-electric power generation lessened.

Geometry-resolved large-eddy simulation of the NREL 5 MW reference wind turbine, which shows velocity isosurfaces at 5.5 m/s after three rotor revolutions. The simulation was performed on the NERSC Cori system with Nalu-Wind, an open-source unstructured grid, low-Mach-number computational fluid dynamics code.

A key challenge for wide-scale deployment of wind power without subsidy is plant-level inefficiencies. Plant-level performance losses can be as high as 20–30% due to complex terrain, unique atmospheric flow phenomena, and the complex flow interactions that occur in large wind farms, which comprise multiple arrays with significant turbine-turbine wake interactions. Addressing the challenge in reducing plant-level losses requires more knowledge of their dynamics to inform optimization of existing plants (through, for example, new control strategies), optimized layout of new plants, and the creation of new wind turbine technology.

The U.S. Department of Energy’s (DOE) Exascale Computing Project (ECP), a joint collaboration of two DOE sponsoring organizations, the Office of Science (DOE-SC) and the National Nuclear Security Administration (NNSA), has funded a research effort named ExaWind under its Application Development focus area.

ECP’s ExaWind project aims to advance the fundamental comprehension of whole wind plant performance by examining wake formation, the impacts of complex terrain, and the effects of turbine-turbine wake interactions. When validated by targeted experiments, the predictive physics-based high-fidelity computational models at the center of the ExaWind project, and the new knowledge derived from their solutions, provide an effective path to optimizing wind plants.

Large-eddy simulation (LES) is a well-known mathematical computational fluid dynamics (CFD) approach to capturing the turbulent flow structures in engineering applications. The ExaWind team recently performed a LES of multiple revolutions of the National Renewable Energy Laboratory (NREL) 5 MW reference turbine with the open-source CFD code called Nalu-Wind. The NREL 5 MW reference turbine is a notional turbine fully defined in the open domain that has the key features of large modern wind turbines.

A body-fitted mesh—or computational geometric representation—of the blades, nacelle (the wind turbine’s encased generating components), and tower geometry were created. The modeling applied in this effort will be used to better understand weak and strong scaling performance of the ExaWind incompressible-flow-solver software stack and to advance the movement toward next-generation computing architectures. The software stack consists of software libraries for setting up and solving the system of equations, whose solution constitutes a numerical approximation of the physical-system continuum solution. This recent success of ExaWind establishes a new baseline capability for simulating modern turbines with body-resolved meshes and enables scientists and engineers to begin understanding the complex flow physics in multi-turbine wind farms that will take advantage of future ExaWind modeling and simulation capability.

Research Context and Objectives

Current methods for modeling wind energy cost and performance fall short due to insufficient model fidelity and inadequate treatment of fundamental phenomena such as atmospheric inflow structure, turbine wake development, and subsequent turbine-turbine wake flow interactions, which are persistently significant factors, especially in complex terrain. Most design and analysis tools simplify the flow physics with empirical representations that fail to capture first principles and/or are not computationally possible with existing simulation capabilities. Among the common deficiencies of the current methods are an inability to accurately model wake structure, a lack of understanding of the impact of different atmospheric turbulent conditions, and inadequate numerical schemes for transition from mesoscale (numerical weather prediction) to LES in CFD for flow within wind farms.

The impediment to predicting and minimizing energy losses and creating new technology options that will maximize performance has compelled ExaWind researchers to develop a predictive simulation capability that the team will use to simulate a wind plant composed of more than 100 multi-megawatt-scale wind turbines located within 100 square kilometers of complex terrain. These simulations require hundreds of billions of grid points to adequately resolve the flow physics and dynamic interactions.

The primary modeling and simulation environment of ExaWind is Nalu-Wind, which is based on the Nalu code developed at Sandia National Laboratories (SNL). Nalu-Wind is an unstructured-grid code that solves the acoustically incompressible Navier-Stokes equations; these equations are well suited for solving the low-Mach-number aerodynamics around the complex moving geometry of wind turbines and wind farms. Nalu-Wind is built on the Trilinos Sierra Toolkit (STK) library and can employ either the Hypre or Trilinos linear-system solver stacks. The ultimate objective of the ExaWind project is to create a predictive wind simulation capability that will run on an exascale-class computer by 2022.

To read more about this simulation, visit the full article here.


Source: Exascale Computing Project

Subscribe to HPCwire's Weekly Update!

Be the most informed person in the room! Stay ahead of the tech trends with industy updates delivered to you every week!

Data West Brings Technology Leaders to SDSC

December 6, 2018

Data and technology enthusiasts from around the world descended upon the San Diego Supercomputing Center (SDSC) for the third annual Data West conference, which is taking place this week on the campus of the University o Read more…

By Alex Woodie

Topology Can Help Us Find Patterns in Weather

December 6, 2018

Topology--–the study of shapes-- seems to be all the rage. You could even say that data has shape, and shape matters. Shapes are comfortable and familiar concepts, so it is intriguing to see that many applications are Read more…

By James Reinders

What’s New in HPC Research: Automatic Energy Efficiency, DNA Data Analysis, Post-Exascale & More

December 6, 2018

In this bimonthly feature, HPCwire highlights newly published research in the high-performance computing community and related domains. From exascale to quantum computing, the details are here. Read more…

By Oliver Peckham

HPE Extreme Performance Solutions

AI Can Be Scary. But Choosing the Wrong Partners Can Be Mortifying!

As you continue to dive deeper into AI, you will discover it is more than just deep learning. AI is an extremely complex set of machine learning, deep learning, reinforcement, and analytics algorithms with varying compute, storage, memory, and communications needs. Read more…

IBM Accelerated Insights

Five Steps to Building a Data Strategy for AI

Our data-centric world is driving many organizations to apply advanced analytics that use artificial intelligence (AI). AI provides intelligent answers to challenging business questions. AI also enables highly personalized user experiences, built when data scientists and analysts learn new information from data that would otherwise go undetected using traditional analytics methods. Read more…

Zettascale by 2035? China Thinks So

December 6, 2018

Exascale machines (of at least a 1 exaflops peak) are anticipated to arrive by around 2020, a few years behind original predictions; and given extreme-scale performance challenges are not getting any easier, it makes sense that researchers are already looking ahead to the next big 1,000x performance goal post: zettascale computing. Read more…

By Tiffany Trader

Topology Can Help Us Find Patterns in Weather

December 6, 2018

Topology--–the study of shapes-- seems to be all the rage. You could even say that data has shape, and shape matters. Shapes are comfortable and familiar conc Read more…

By James Reinders

Zettascale by 2035? China Thinks So

December 6, 2018

Exascale machines (of at least a 1 exaflops peak) are anticipated to arrive by around 2020, a few years behind original predictions; and given extreme-scale performance challenges are not getting any easier, it makes sense that researchers are already looking ahead to the next big 1,000x performance goal post: zettascale computing. Read more…

By Tiffany Trader

Robust Quantum Computers Still a Decade Away, Says Nat’l Academies Report

December 5, 2018

The National Academies of Science, Engineering, and Medicine yesterday released a report – Quantum Computing: Progress and Prospects – whose optimism about Read more…

By John Russell

Revisiting the 2008 Exascale Computing Study at SC18

November 29, 2018

A report published a decade ago conveyed the results of a study aimed at determining if it were possible to achieve 1000X the computational power of the the Read more…

By Scott Gibson

AWS Debuts Lustre as a Service, Accelerates Data Transfer

November 28, 2018

From the Amazon re:Invent main stage in Las Vegas today, Amazon Web Services CEO Andy Jassy introduced Amazon FSx for Lustre, citing a growing body of applicati Read more…

By Tiffany Trader

AWS Launches First Arm Cloud Instances

November 28, 2018

AWS, a macrocosm of the emerging high-performance technology landscape, wants to be everywhere you want to be and offer everything you want to use (or at least Read more…

By Doug Black

Move Over Lustre & Spectrum Scale – Here Comes BeeGFS?

November 26, 2018

Is BeeGFS – the parallel file system with European roots – on a path to compete with Lustre and Spectrum Scale worldwide in HPC environments? Frank Herold Read more…

By John Russell

DOE Under Secretary for Science Paul Dabbar Interviewed at SC18

November 21, 2018

During the 30th annual SC conference in Dallas last week, SC18 hosted U.S. Department of Energy Under Secretary for Science Paul M. Dabbar. In attendance Nov. 13-14, Dabbar delivered remarks at the Top500 panel, met with a number of industry stakeholders and toured the show floor. He also met with HPCwire for an interview, where we discussed the role of the DOE in advancing leadership computing. Read more…

By Tiffany Trader

Quantum Computing Will Never Work

November 27, 2018

Amid the gush of money and enthusiastic predictions being thrown at quantum computing comes a proposed cold shower in the form of an essay by physicist Mikhail Read more…

By John Russell

Cray Unveils Shasta, Lands NERSC-9 Contract

October 30, 2018

Cray revealed today the details of its next-gen supercomputing architecture, Shasta, selected to be the next flagship system at NERSC. We've known of the code-name "Shasta" since the Argonne slice of the CORAL project was announced in 2015 and although the details of that plan have changed considerably, Cray didn't slow down its timeline for Shasta. Read more…

By Tiffany Trader

IBM at Hot Chips: What’s Next for Power

August 23, 2018

With processor, memory and networking technologies all racing to fill in for an ailing Moore’s law, the era of the heterogeneous datacenter is well underway, Read more…

By Tiffany Trader

House Passes $1.275B National Quantum Initiative

September 17, 2018

Last Thursday the U.S. House of Representatives passed the National Quantum Initiative Act (NQIA) intended to accelerate quantum computing research and developm Read more…

By John Russell

CERN Project Sees Orders-of-Magnitude Speedup with AI Approach

August 14, 2018

An award-winning effort at CERN has demonstrated potential to significantly change how the physics based modeling and simulation communities view machine learni Read more…

By Rob Farber

Summit Supercomputer is Already Making its Mark on Science

September 20, 2018

Summit, now the fastest supercomputer in the world, is quickly making its mark in science – five of the six finalists just announced for the prestigious 2018 Read more…

By John Russell

AMD Sets Up for Epyc Epoch

November 16, 2018

It’s been a good two weeks, AMD’s Gary Silcott and Andy Parma told me on the last day of SC18 in Dallas at the restaurant where we met to discuss their show news and recent successes. Heck, it’s been a good year. Read more…

By Tiffany Trader

US Leads Supercomputing with #1, #2 Systems & Petascale Arm

November 12, 2018

The 31st Supercomputing Conference (SC) - commemorating 30 years since the first Supercomputing in 1988 - kicked off in Dallas yesterday, taking over the Kay Ba Read more…

By Tiffany Trader

Leading Solution Providers

SC 18 Virtual Booth Video Tour

Advania @ SC18 AMD @ SC18
ASRock Rack @ SC18
DDN Storage @ SC18
HPE @ SC18
IBM @ SC18
Lenovo @ SC18 Mellanox Technologies @ SC18
NVIDIA @ SC18
One Stop Systems @ SC18
Oracle @ SC18 Panasas @ SC18
Supermicro @ SC18 SUSE @ SC18 TYAN @ SC18
Verne Global @ SC18

TACC’s ‘Frontera’ Supercomputer Expands Horizon for Extreme-Scale Science

August 29, 2018

The National Science Foundation and the Texas Advanced Computing Center announced today that a new system, called Frontera, will overtake Stampede 2 as the fast Read more…

By Tiffany Trader

HPE No. 1, IBM Surges, in ‘Bucking Bronco’ High Performance Server Market

September 27, 2018

Riding healthy U.S. and global economies, strong demand for AI-capable hardware and other tailwind trends, the high performance computing server market jumped 28 percent in the second quarter 2018 to $3.7 billion, up from $2.9 billion for the same period last year, according to industry analyst firm Hyperion Research. Read more…

By Doug Black

Nvidia’s Jensen Huang Delivers Vision for the New HPC

November 14, 2018

For nearly two hours on Monday at SC18, Jensen Huang, CEO of Nvidia, presented his expansive view of the future of HPC (and computing in general) as only he can do. Animated. Backstopped by a stream of data charts, product photos, and even a beautiful image of supernovae... Read more…

By John Russell

Germany Celebrates Launch of Two Fastest Supercomputers

September 26, 2018

The new high-performance computer SuperMUC-NG at the Leibniz Supercomputing Center (LRZ) in Garching is the fastest computer in Germany and one of the fastest i Read more…

By Tiffany Trader

Houston to Field Massive, ‘Geophysically Configured’ Cloud Supercomputer

October 11, 2018

Based on some news stories out today, one might get the impression that the next system to crack number one on the Top500 would be an industrial oil and gas mon Read more…

By Tiffany Trader

Intel Confirms 48-Core Cascade Lake-AP for 2019

November 4, 2018

As part of the run-up to SC18, taking place in Dallas next week (Nov. 11-16), Intel is doling out info on its next-gen Cascade Lake family of Xeon processors, specifically the “Advanced Processor” version (Cascade Lake-AP), architected for high-performance computing, artificial intelligence and infrastructure-as-a-service workloads. Read more…

By Tiffany Trader

Google Releases Machine Learning “What-If” Analysis Tool

September 12, 2018

Training machine learning models has long been time-consuming process. Yesterday, Google released a “What-If Tool” for probing how data point changes affect a model’s prediction. The new tool is being launched as a new feature of the open source TensorBoard web application... Read more…

By John Russell

The Convergence of Big Data and Extreme-Scale HPC

August 31, 2018

As we are heading towards extreme-scale HPC coupled with data intensive analytics like machine learning, the necessary integration of big data and HPC is a curr Read more…

By Rob Farber

  • arrow
  • Click Here for More Headlines
  • arrow
Do NOT follow this link or you will be banned from the site!
Share This