# Need to remove unwanted boundary

**URL:** https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740
**Category:** ParaView Support
**Created:** [March 19, 2021, 8:22am UTC](https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740 "2021-03-19T08:22:33Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Dinushika1992](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/d/a88e4f/32.png) [@Dinushika1992](https://discourse.paraview.org/u/Dinushika1992)
#### Post date: [March 19, 2021, 8:22am UTC](https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740/1 "2021-03-19T08:22:33Z")

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Hi,

I’m using the Lattice Boltzmann method to simulate blood flow. Here’s the flow channel I’d like to create.

 ![image](https://discourse.paraview.org/uploads/default/original/2X/8/8037846305d12a928127a2859f51d98795b4e2b9.png)  
However, after the simulation, I get something like this.  
 ![image](https://discourse.paraview.org/uploads/default/original/2X/6/6f28b011315fc0c86b30ab8cfbf27c27d9668dc2.png)  
It has an unwanted boundary. Could you please assist me in removing them? Thanks!

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### Author: ![massisenergy](https://discourse.paraview.org/user_avatar/discourse.paraview.org/massisenergy/32/6229_2.png) [@massisenergy](https://discourse.paraview.org/u/massisenergy)
#### Post date: [March 19, 2021, 6:25pm UTC](https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740/2 "2021-03-19T18:25:35Z")

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Can you please give more information? What is your simulation platform & what is the mesh file format?

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### Author: ![Dinushika1992](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/d/a88e4f/32.png) [@Dinushika1992](https://discourse.paraview.org/u/Dinushika1992)
#### Post date: [March 22, 2021, 4:57am UTC](https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740/3 "2021-03-22T04:57:17Z")

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I use the High-Performance Computing (HPC).  
This is my job script;  
“#!/bin/bash -l  
#PBS -N pipeflow  
#PBS -l walltime=24:00:00  
#PBS -l select=1:ncpus=8:mpiprocs=8:mem=32GB  
#PBS -j oe”  
Results are written as .xmf files  
 ![image](https://discourse.paraview.org/uploads/default/original/2X/c/cf914c2a577542025ef4fa5b12ad5ee39a848e1c.png)  
Thank you!

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### Author: ![massisenergy](https://discourse.paraview.org/user_avatar/discourse.paraview.org/massisenergy/32/6229_2.png) [@massisenergy](https://discourse.paraview.org/u/massisenergy)
#### Post date: [March 23, 2021, 2:40pm UTC](https://discourse.paraview.org/t/need-to-remove-unwanted-boundary/6740/4 "2021-03-23T14:40:59Z")

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Sorry, unable to help you! I thought it might be “openFoam” software platform, which it is not.