# Starting simulation for test pump

**URL:** <https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838>\
**Category:** Fluid Flow / CFD\
**Created:** [February 26, 2025, 8:06am UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838 "2025-02-26T08:06:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![GoldenDragonfly](https://www.simscale.com/forum/letter_avatar/goldendragonfly/32/5_5575768a8748004e209b776fc1b2916d.png) [@GoldenDragonfly](https://www.simscale.com/forum/u/GoldenDragonfly)\
**Post date:** [February 26, 2025, 8:06am UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838/1 "2025-02-26T08:06:14Z")

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I want to simulate a simple a simple tube that is under constant pressure, as well as has a component that moves to draw fluid into the barrel from (0 \<t(s)\<5 ), waits a little bit 9around (0.5 s), then goes back to its original position at t=10.5 (s).  
As such below

 ![IMG_0226](https://www.simscale.com/forum/uploads/default/original/3X/3/8/385ddae8481e69e750db75c6e3f50cf84f29355d.jpeg)

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**Author:** ![shenoy](https://www.simscale.com/forum/letter_avatar/shenoy/32/5_5575768a8748004e209b776fc1b2916d.png) [@shenoy](https://www.simscale.com/forum/u/shenoy)\
**Post date:** [February 26, 2025, 12:22pm UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838/2 "2025-02-26T12:22:12Z")

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Hey @GoldenDragonfly

Thanks for posting on the Forum.

I am assuming there is a mistake in the time notation in the second part of the image where t=5.5 would be on the right and t=10.5 on the left position.

From what I understand, I think you can start with [getting the flow region](https://www.simscale.com/knowledge-base/flow-volume-extraction/) for the flow simulation. You can then use time-dependent boundary conditions to simulate maybe a sinusoidal velocity inlet on the constant pressure side and a pressure outlet boundary condition on the exit side. You can use [table inputs](https://www.simscale.com/docs/simulation-setup/boundary-conditions/tables/) to do that or use [conditional expressions (formulas)](https://www.simscale.com/docs/simulation-setup/boundary-conditions/formulas/).

Best,  
Satvik

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**Author:** ![GoldenDragonfly](https://www.simscale.com/forum/letter_avatar/goldendragonfly/32/5_5575768a8748004e209b776fc1b2916d.png) [@GoldenDragonfly](https://www.simscale.com/forum/u/GoldenDragonfly)\
**Post date:** [March 1, 2025, 11:33am UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838/3 "2025-03-01T11:33:33Z")

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Thanks for replying, I was able to get a flow region for the inside of the pump, but now I’m wondering if I need to make a flow region similar to a rotation zone. Would I make a region and exclude that volume from the flow region?

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**Author:** ![igaviano](https://www.simscale.com/forum/user_avatar/www.simscale.com/igaviano/32/73967_2.png) [@igaviano](https://www.simscale.com/forum/u/igaviano)\
**Post date:** [April 2, 2025, 10:08pm UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838/4 "2025-04-02T22:08:15Z")

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Hi @GoldenDragonfly, as Satvik mentioned, you can stablish time-dependent boundary conditions in SimScale. However, these would be exclusive to the boundaries.

SimScale currently does not support any sort of mesh adaptation - so unfortunately a moving boundary inside the domain wouldn’t be supported. Please add this as a feature request on our public roadmap page: **[https://roadmap.simscale.com/](https://roadmap.simscale.com/)**

Cheers  
Igor