August 29, 2023 at 10:53 amCaleb WoodSubscriber
I am simulating water waves impacting a rigid structure and cannot figure out the parameters to use for EOS_LINEAR_POLYNOMIAL. All literature I look at use different values, and some papers only define C0 and C1 whereas others define C0 through C6. When I use these values my results are terrible. If, however, I choose to use EOS_MURNAGHAN my results look a lot better visually but my pressure readings which I am verifying against a paper are off.
Can someone explain to me why different papers use a different EOS_LINEAR_POLYNOMIAL if they are both simulating water? Also, would it be possible to provide me with the values for the EOS in the kg-m-s-Pa unit system? Thank you.
August 29, 2023 at 6:59 pmLoic IvaldiAnsys Employee
Hello, if you can show me some papers I could have a better view.
Normally you can use this :
$# mid ro pc mu terod cerod ym pr
2 1000.0 -10.0 0.001 0.0 0.0 0.0 0.0
$# eosid c0 c1 c2 c3 c4 c5 c6
2 0.02.200000E9 0.0 0.0 0.0 0.0 0.0
$# e0 v0
August 29, 2023 at 7:05 pmCaleb WoodSubscriber
Thank you, Loic. The paper I am trying to replicate can be found here: https://doi.org/10.1016/j.apor.2011.08.002
It examines waves impacting a plate in 2D using the SPH method. I am attempting to re-create it in 3D using either the ALE or S-ALE method. The model appears to be working well but the contact pressures are coming out 2-3 kPa to low.
August 29, 2023 at 7:30 pmLoic IvaldiAnsys Employee
Try with the eos parameter I gave you. You'll can try the murnaghan to speed up your run once the results with the eos_polynomial are satisfying. Also, try to refine the mesh to see if there is convergence between meshes.
Also, don't forget SPH and ALE are two different methods. When you use SPH, you use a *CONTACT_AUTOMATIC_NODES_TO_SURFACE between fluid and structure and it's totally different than the coupling in ALE with a *CONSTRAINED_LAGRANGE_IN_SOLID or *ALE_STRUCTURED_FSI so you will expect variation.
- You must be logged in to reply to this topic.
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.
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.
- Explicit dynamics ERRORS
- explicit dynamics
- turning simulation
- getting zero maximum and minimum stress value in explicit analysis
- How to figure out impact force in Explicit Dynamic Analysis
- How do get Full values instead of just minimum and maximum ?
- Running an explicit dynamics simulation on a composite plate
- Monte Carlo Simulation
- Euler Domain Restricting Simulation
- How to solve Energy error too large
© 2023 Copyright ANSYS, Inc. All rights reserved.