# Mesh discretization / mesh "progression"

**URL:** <https://prepomax.discourse.group/t/mesh-discretization-mesh-progression/2843>\
**Category:** General Questions\
**Created:** [July 14, 2025, 7:35am UTC](https://prepomax.discourse.group/t/mesh-discretization-mesh-progression/2843 "2025-07-14T07:35:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Paul18fr](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@Paul18fr](https://prepomax.discourse.group/u/Paul18fr)\
**Post date:** [July 14, 2025, 7:35am UTC](https://prepomax.discourse.group/t/mesh-discretization-mesh-progression/2843/1 "2025-07-14T07:35:42Z")

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Hi,

I’m looking for a finer meshing approach: **no compound nor transfinite here: each volume is meshed separately** and duplicate nodes will be merged (equiv “coherence” gmsh option).

Some questions:

- In the attachment, i tried to impose a specific discretization on one side; i played with a max size parameter ( **iterative way** ) but i failed =\> is there a **direct way** to impose it?

- in [this post](https://prepomax.discourse.group/t/failed-to-mesh-with-using-prepomax-new-gmsh-options/1222/27), odd numbers cannot be imposed (but from memory gmsh can do): still the case?

- (i’ve ever noticed the number of layers can be defined on the extrusion direction)

- the gmsh “progression” option seems not to be possible for now; i can imagine how it is difficult to manage for a compound with dozens of volumes, but for a single one if using “extrude”, “resolve”, “sweep”, etc?

Thanks for your feedback

Paul

 ![screenshot](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/c/cfc2636820b42ac5befbe33cab0dba1ea558ad15.png)  
[cone.pmx](https://prepomax.discourse.group/uploads/short-url/hkJWjG2ECsuHUd3lg5bozeI54Vs.pmx) (76.0 KB)

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [July 14, 2025, 8:05am UTC](https://prepomax.discourse.group/t/mesh-discretization-mesh-progression/2843/2 "2025-07-14T08:05:23Z")

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> [@Paul18fr](#):
>
> is there a **direct way** to impose it?

Currently, there’s no way to set the number of elements directly if that’s what you mean: [Mesh refinement of edges with gmsh](https://prepomax.discourse.group/t/mesh-refinement-of-edges-with-gmsh/1378)

> [@Paul18fr](#):
>
> in [this post](https://prepomax.discourse.group/t/failed-to-mesh-with-using-prepomax-new-gmsh-options/1222/27), odd numbers cannot be imposed (but from memory gmsh can do): still the case?

I don’t think anything changed in this regard.

> [@Paul18fr](#):
>
> (i’ve ever noticed the number of layers can be defined on the extrusion direction)

Yes, you can set the number of elements in the extrusion or revolution direction and even create multiple layers with different sizes and numbers of elements.

> [@Paul18fr](#):
>
> the gmsh “progression” option seems not to be possible for now; i can imagine how it is difficult to manage for a compound with dozens of volumes, but for a single one if using “extrude”, “resolve”, “sweep”, etc?

See this: [Useful additional gmsh functionality - #24 by Gunnar](https://prepomax.discourse.group/t/useful-additional-gmsh-functionality/1343/24)

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<div class="post-metadata">

**Author:** ![Paul18fr](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@Paul18fr](https://prepomax.discourse.group/u/Paul18fr)\
**Post date:** [July 15, 2025, 6:18am UTC](https://prepomax.discourse.group/t/mesh-discretization-mesh-progression/2843/3 "2025-07-15T06:18:55Z")

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Thanks Jakub for the answers as well as for the links.