memory issue after using UDF

- February 8, 2021 at 6:11 pm
  
  Touq
  Subscriber
  
  Hi,I'm currying out a combustion simulation using PDF approach and intending to modify the calculation of a parameter via UDF. In this calculation, the species mole fraction is required. Therefore, I needed to access the look-up table to obtain the species mole fractions which requires to interpolate the PDF variables using 'Interpolate_multi_table' macro to then get the species mole fractions from 'for loop'. nThe code was successfully compiled and the iterations of the simulation started without getting any error. After a couple of time steps, the memory of my computer got fully used by Fluent and then the simulation stopped. However, when I removed the PDF interpolation and replaced the species mole fractions with fixed numbers in the calculations, the simulation continued and Fluent used roughly 10% of my computer's memory.Can you please guide to overcome this issue especially the memory of my system is 120 GB? n
- February 17, 2021 at 9:59 pm
  
  Konstantin
  Ansys Employee
  
  Hello Touq,nThis is an internal function which we unfortunately cannot comment on in this forum. My general suggestion is to use built in product capabilities which can address most reacting flow applications.n
- February 18, 2021 at 1:32 am
  
  YasserSelima
  Subscriber
  
  Try to clear variables from memory at the end of a the function. This might be helpfulhttp://www.cplusplus.com/forum/beginner/82290/n

Viewing 2 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