# Hex vs Prism mesh for farfield

**URL:** <https://pyfr.discourse.group/t/hex-vs-prism-mesh-for-farfield/857>\
**Category:** Cases\
**Tags:** mesh\
**Created:** [22 June 2023 10:31 UTC](https://pyfr.discourse.group/t/hex-vs-prism-mesh-for-farfield/857 "2023-06-22T10:31:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Frankx9](https://avatars.discourse-cdn.com/v4/letter/f/3e96dc/32.png) [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\
**Post date:** [22 June 2023 10:31 UTC](https://pyfr.discourse.group/t/hex-vs-prism-mesh-for-farfield/857/1 "2023-06-22T10:31:19Z")

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Hi,

according to your experiences, do you have any recommendations for far-fields elements? Is it better to have prisms or hexahedral?  
What about:

- solution accuracy
- runtime for the same DoFs
- mesh partitions & load balancing (e.g. with prisms in the farfield a mixed element grid is needed, any issues or problems or improvements to that?)

Regards

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<div class="post-metadata">

**Author:** ![fdw](https://avatars.discourse-cdn.com/v4/letter/f/a587f6/32.png) [@fdw](https://pyfr.discourse.group/u/fdw)\
**Post date:** [23 June 2023 14:09 UTC](https://pyfr.discourse.group/t/hex-vs-prism-mesh-for-farfield/857/2 "2023-06-23T14:09:27Z")

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For the far-field the ideal element type is hexahedra. They are the most efficient on a per-DOF basis. However, as it can sometimes be difficult to generate meshes with hexahedral far-fields it is not uncommon to see prisms being used.

Regards, Freddie.