Negative K Value in xxx cells

- June 25, 2023 at 6:09 am
  
  Agung Limowa
  Subscriber
  
  Hi, i have a problem with my model it iterates a few times and show divergence and residual spike, how i overcome this?, i am modelling a duct and a tunnel but after 100 iteration what happened is the floating point exception and show message negative K in xxx cells how i can handled this
- June 26, 2023 at 7:54 am
  
  SRP
  Ansys Employee
  
  Hi,
  It is mostly due to bad convergence, or bad mesh, or both. It also occurs when a user adds a negative source term to the "k" equation.
  Thank you.
- June 26, 2023 at 8:28 am
  
  Agung Limowa
  Subscriber
  
  how can i can overcome this ?
- June 26, 2023 at 10:35 am
  
  Rob
  Ansys Employee
  
  Check the mesh quality: note that's cell metrics (in Meshing) and resolution (Meshing or the Fluent solver). You'll need to look at and then judge the latter.

Viewing 3 reply threads

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