“bad allocation” error in FDTD

- February 17, 2021 at 3:29 pm
  
  alshelton
  Subscriber
  
  Hello!
  I'm attempting to run a parameter sweep in FDTD, and even though the individual files of the sweep have run and display results, when I attempt to load the individual files into the sweep as a whole, I receive an error reading "bad allocation" and am entirely unable to view any results in the visualize window. The simulation gives this error loading in the 75th simulation and does not save any data to the sweep on the base file.
  My simulation is a model of a gold nano-antenna on top of a thin film and a glass substrate. For the sweep we vary the length of the antenna from 50 to 200nm using 75 points in the range. Each simulation is about 6.5GB of memory and the mesh is non-uniform with a max step of 1nm. A few photos are attached.
  Please let me know if I can provide any more details, we have no idea how to handle this error.
- February 17, 2021 at 5:30 pm
  
  Kyle
  Ansys Employee
  
  Hello alshelton,nI believe the issue is there isn't enough memory to load all of the of parameter sweep results. The E field results in particular require a large amount of memory, especially if you are recording at multiple frequency points. I would recommend that you test this by reducing the size of the results you're recording somehow, for example by only recording the T transmission results. I believe you should be able to do this without running the sweep again by removing the other results from the parameter sweep, right clicking on the sweep and selecting Load from files.nnPlease let me know if that helps.n

Viewing 1 reply thread

You must be logged in to reply to this topic.

Ansys Innovation Space

Boost Ansys Fluent Simulations with AWS

Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions