> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# UI and Blocks

nTop Fluids features are currently [beta blocks](https://support.ntop.com/hc/en-us/articles/360062442113-What-are-beta-blocks). To access them, check *'Show beta blocks'* in your general settings.

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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/turn-on-beta-blocks-1-1024x643.gif" />
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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/image-11-1024x124.png" />
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After showing beta blocks, you will see the *Fluids \[Beta]* tab appear. You can now access a series of dropdown lists containing blocks you can use to set up a flow analysis.

## Flow Analysis Block

Begin setting up your simulation by adding the **Flow Analysis** block to your notebook. Every block you use to define your flow analysis problem will get referenced here.

The **Flow Analysis** block has three inputs which we will explore in the following lessons.

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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/image.png" />
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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/model-icon.png" />
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### Model

Define the fluid domain and material attributes to simulate.

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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/boundary-condition.png" />
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### Boundary Conditions

Assign pressure and velocity at inlet(s) and outlet(s).

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  <img src="https://files.learn.ntop.com/lessons/ui-and-blocks-2/cell-size.png" />
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### Cell Size

Assign a size for the cells used in the analysis.