# Creating inner flow volume

**URL:** <https://www.simscale.com/forum/t/creating-inner-flow-volume/101387>\
**Category:** CAD & Meshing\
**Created:** [October 7, 2026, 10:15pm UTC](https://www.simscale.com/forum/t/creating-inner-flow-volume/101387 "2026-10-07T22:15:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![upasse](https://www.simscale.com/forum/letter_avatar/upasse/32/5_5575768a8748004e209b776fc1b2916d.png) [@upasse](https://www.simscale.com/forum/u/upasse)\
**Post date:** [October 7, 2026, 10:15pm UTC](https://www.simscale.com/forum/t/creating-inner-flow-volume/101387/1 "2026-10-07T22:15:16Z")

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Hello I want to created an inner flow volume with this Rhino model, the instruction are not clear how and why this does not work, can someone send me a visual example what I need to change?

I have two boxes with inner volume and a wall inbetween with a hole, all walls are one solid