# CFD convergence issue of a full body car simulation

**URL:** https://www.simscale.com/forum/t/cfd-convergence-issue-of-a-full-body-car-simulation/82746
**Category:** Fluid Flow / CFD
**Created:** [July 7, 2018, 8:28am UTC](https://www.simscale.com/forum/t/cfd-convergence-issue-of-a-full-body-car-simulation/82746 "2018-07-07T08:28:11Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![DaleKramer](https://www.simscale.com/forum/user_avatar/www.simscale.com/dalekramer/32/20201_2.png) [@DaleKramer](https://www.simscale.com/forum/u/DaleKramer)
#### Post date: [August 10, 2018, 5:20am UTC](https://www.simscale.com/forum/t/cfd-convergence-issue-of-a-full-body-car-simulation/82746/8 "2018-08-10T05:20:07Z")

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@siddhartha225

I too have been perplexed by layering of late, all GREAT suggestions given here to help but you can maybe also try this:

If you are using Hex Parametric meshing algorithm, could you report to me what weighted % inflated you have currently have of the poorly layered mesh ([procedure found here](https://www.simscale.com/forum/t/xflr5-vs-cfd/82854/59)).

And then change one parameter, ‘Max face aspect ratio for layers’ to a value of 100 or higher, then make a mesh and then report back here on the new weighted % inflated of the resultant mesh.

I am trying to figure out if [the discussion here about CFX solver](https://www.cfd-online.com/Forums/cfx/24593-aspect-ratio-cfx-solver-suggested-value.html#post83927) aspect ratio limits would help here and if this is the correct parameter that we can test changing aspect ratio on.

Also, you may find some of [my personal meshing strategy found here](https://www.simscale.com/forum/t/xflr5-vs-cfd/82854/30), helpful. It looks to me that item 12 would be helpful for your layering.

Dale

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