Solving large structural analysis problem

Citation

(2009), "Solving large structural analysis problem", Aircraft Engineering and Aerospace Technology, Vol. 81 No. 3. https://doi.org/10.1108/aeat.2009.12781cab.001

Solving large structural analysis problem

Article Type: Aerospace technology From: Aircraft Engineering and Aerospace Technology: An International Journal, Volume 81, Issue 3

Siemens Product Lifecycle Management (PLM) Software, a business unit of the Siemens Industry Automation Division and a provider of PLM software and services, has announced a computational break-through in implicit finite element analysis (FEA) technology. Using commercially available hardware, the current production version of the company’s NX NASTRAN software was able to solve a structural analysis problem with a half-billion equations “virtually overnight.”

The analysis was conducted to simulate the behaviour of an entire aeroplane wing structure undergoing a bending test. The resulting problem size of 500 million equations was successfully completed in less than 18 h of elapsed time and shattered Siemens PLM Software’s previous record – announced in February 2006 – which was also set by NX NASTRAN for a similar problem. To provide perspective, a structural analysis of an entire automobile body modelled with shell elements, could be solved with about 100 million equations.

“Our customers make some of the world’s most sophisticated products, requiring extremely detailed finite element models to achieve the solution fidelity necessary to ensure their quality and safety,” said Chuck Grindstaff, Chief Technology Officer of Siemens PLM Software. “Simulating the destructive wing-bending test is an especially important component of virtual product development in aeroplane manufacturing and the 18-hour turnaround time provides a solution virtually overnight. As a result, our customers’ workflow process can proceed uninterrupted.”

“Such large problem sizes were considered impossible just a few years ago, both from a numerical accuracy and computational complexity point of view,” added Dr Louis Komzsik, Chief Numerical Analyst of Siemens PLM Software. “Today, we can confidently predict that solving a one billion equation problem will be feasible in the near future. And with the demonstrated ability of NX NASTRAN to solve these huge problems, imagine how fast it can solve the more typical analysis problems encountered everyday by our customers, across a wide variety of industries.”

The FEA model solved by NX NASTRAN consisted of 100 million grids along with approximately 98 million shell and 49 million solid elements. The resulting finite element problem consisted of 500 million equations and had more than 600 million global degrees of freedom when a linear static analysis with a single load condition was executed.

The analysis required 1,069 min or 17.8 h of elapsed time on an IBM Power 570 server. The computer contained eight POWER 6 cores at 4.7 GHz, 64 GB of memory and 24 striped disks of 148 GB capacity each. The analysis used 42.4 GB of memory, executed 30.3 Tera bytes of I/O operations with a 2.26 Tera Byte disk footprint. For more information on NX NASTRAN, please visit: www.siemens.com/plm/nxnastran

Details available from: Siemens PLM Software, Tel.: +1 314 264 8216, web site: www.siemens.com/plm