# Generate "fluid" geometry

**URL:** <https://www.simscale.com/forum/t/generate-fluid-geometry/85628>\
**Category:** Vote for features!\
**Created:** [June 10, 2019, 3:15pm UTC](https://www.simscale.com/forum/t/generate-fluid-geometry/85628 "2019-06-10T15:15:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gsonnenf](https://www.simscale.com/forum/user_avatar/www.simscale.com/gsonnenf/32/6847_2.png) [@gsonnenf](https://www.simscale.com/forum/u/gsonnenf)\
**Post date:** [June 10, 2019, 3:15pm UTC](https://www.simscale.com/forum/t/generate-fluid-geometry/85628/1 "2019-06-10T15:15:40Z")

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- Which feature do you need?  
It would be great is Simscale could generate basic “fluid” blocks/geometry around parts.

- What is the problem that you want to address with this feature?  
Though, I understand Simscale should not be a CAD software, most 3d parts come without a “fluid cavity” for air or liquid flow. Some basic CAD programs don’t even have this feature. It would be great if we could just draw a cube around CAD model and the Simscale would turn those into the fluid mesh with mapped boundaries. This seems to be a “simulation specific feature” rather than a “part design feature”. it would be appropriate for Simscale to implement.

- What is the expected outcome?  
Draw a block around a parts model and it becomes a block of air/fluid.

- Can you share application examples, ideally with project links on SimScale?  
My CAD software doesn’t have a cavity feature. I want to draw that airblock in Simscale and have it mesh and map faces automatically.

> **[basic cylinder test by gsonnenf | SimScale](https://www.simscale.com/projects/gsonnenf/basic_cylinder_test/)**
>
> Basic test of thermal stuff with a cylinder | Simulation project by gsonnenf

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**Author:** ![rszoeke](https://www.simscale.com/forum/user_avatar/www.simscale.com/rszoeke/32/14_2.png) [@rszoeke](https://www.simscale.com/forum/u/rszoeke)\
**Post date:** [June 10, 2019, 3:33pm UTC](https://www.simscale.com/forum/t/generate-fluid-geometry/85628/2 "2019-06-10T15:33:32Z")

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Hi @gsonnenf,  
today is your lucky day! This feature already exists as “Geometry Operation” on SimScale - check out the documentation: [How to Create Flow Volume Extraction? | Knowledge Base | SimScale](https://www.simscale.com/docs/cad-preparation/fluid-volume-extraction/)

Let us know if this does not cover all your needs!

Best,  
Richard