# \#meshio

**URL:** https://fenicsproject.discourse.group/tag/meshio/46.md

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## [Time-dependent mesh-output with higher order elements](https://fenicsproject.discourse.group/t/time-dependent-mesh-output-with-higher-order-elements/19788)

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**Author:** [@MathPhy42](https://fenicsproject.discourse.group/u/MathPhy42)\
**Replies:** 3\
**Last updated:** [August 6, 2026, 2:00pm UTC](https://fenicsproject.discourse.group/t/time-dependent-mesh-output-with-higher-order-elements/19788 "2026-08-06T14:00:56Z")

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Hi everyone, I want to use some ALE-method with remeshing, but I have problems writing my velocity field, which is composed of second order Lagrange-elements, in a single output file. I have tried all 3 types of writer…

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## [Mesh.locate\_entities\_boundary() does not seem to work if importing mesh nodes and cells](https://fenicsproject.discourse.group/t/mesh-locate-entities-boundary-does-not-seem-to-work-if-importing-mesh-nodes-and-cells/17976)

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**Author:** [@alex24](https://fenicsproject.discourse.group/u/alex24)\
**Replies:** 3\
**Last updated:** [July 14, 2025, 6:13pm UTC](https://fenicsproject.discourse.group/t/mesh-locate-entities-boundary-does-not-seem-to-work-if-importing-mesh-nodes-and-cells/17976 "2025-07-14T18:13:13Z")

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Hi, When I generate a mesh using dolfinx, I can do the following and it generates the right boundary condition: # Function to mark noslip bc def noslip\_boundary2(x): return np.isclose(x\[2\], z\_val) # No slip bounda…

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## [Use Meshio to read the grid data(.nas) generated by Comsol, KeyError: 'wedge15'](https://fenicsproject.discourse.group/t/use-meshio-to-read-the-grid-data-nas-generated-by-comsol-keyerror-wedge15/16831)

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**Author:** [@Mm\_Wu](https://fenicsproject.discourse.group/u/Mm_Wu)\
**Replies:** 1\
**Last updated:** [January 24, 2025, 5:49am UTC](https://fenicsproject.discourse.group/t/use-meshio-to-read-the-grid-data-nas-generated-by-comsol-keyerror-wedge15/16831 "2025-01-24T05:49:59Z")

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The code is as follows: \> import meshio \> nas = meshio.read("mesh/file\_name.nas") An error is reported after the running： Traceback (most recent call last): File "/opt/project/learn\_fenics/meshtrans.py", line 2, in \<…

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## [Cannot read facetag when converting .bdf file genarted from hypermesh to xdmf](https://fenicsproject.discourse.group/t/cannot-read-facetag-when-converting-bdf-file-genarted-from-hypermesh-to-xdmf/15339)

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**Author:** [@Alexanderpandiyan](https://fenicsproject.discourse.group/u/Alexanderpandiyan)\
**Replies:** 22\
**Last updated:** [August 6, 2024, 7:48am UTC](https://fenicsproject.discourse.group/t/cannot-read-facetag-when-converting-bdf-file-genarted-from-hypermesh-to-xdmf/15339 "2024-08-06T07:48:20Z")

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Hello all, I’m attempting to replicate the example provided in this tutorial by creating a hexahedral mesh domain using Hypermesh. I have also identified and tagged the facets separately to apply boundary conditions. H…

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## [Using tetra and triangle or line and triagle elements](https://fenicsproject.discourse.group/t/using-tetra-and-triangle-or-line-and-triagle-elements/14999)

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**Author:** [@Mirialex](https://fenicsproject.discourse.group/u/Mirialex)\
**Replies:** 7\
**Last updated:** [June 22, 2024, 3:22pm UTC](https://fenicsproject.discourse.group/t/using-tetra-and-triangle-or-line-and-triagle-elements/14999 "2024-06-22T15:22:15Z")

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hi all, im trying to create a mesh with my gmsh application installed on my pc and import it to xdmf i was wondering if im creating a 2d model and extrude it to 3d, should i user tetra and triangle element or line and …