# How to Append Node-Based Pore Water Pressure (PWP) Data to a VTU File in ParaView
**URL:** https://discourse.paraview.org/t/how-to-append-node-based-pore-water-pressure-pwp-data-to-a-vtu-file-in-paraview/15540
**Category:** ParaView Support
**Tags:** vtk
**Created:** [October 11, 2024, 6:51pm UTC](https://discourse.paraview.org/t/how-to-append-node-based-pore-water-pressure-pwp-data-to-a-vtu-file-in-paraview/15540 "2024-10-11T18:51:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@najafi](https://discourse.paraview.org/u/najafi)
#### Post date: [October 11, 2024, 6:51pm UTC](https://discourse.paraview.org/t/how-to-append-node-based-pore-water-pressure-pwp-data-to-a-vtu-file-in-paraview/15540/1 "2024-10-11T18:51:09Z")
Hello everyone,
I’m working with a 3D mesh model in ParaView that was generated using [OpenSees](https://openseespydoc.readthedocs.io/en/latest/src/pvdRecorder.html), and I have the mesh data saved in a `.vtu` file. Additionally, I have pore water pressure (PWP) data for all the nodes, which is stored in a separate text file. The text file contains two columns: one for `Node ID` and the other for the corresponding `PWP` values.
I would like to append the PWP data from the text file to the VTU mesh in ParaView, so I can visualize the PWP distribution across the model. However, I’m having difficulty mapping the PWP data to the correct nodes in the VTU file. I tried using the `Append Attributes` filter, but it seems like the data is not merging correctly.
**My setup:**
- The `.vtu` file has the 3D mesh, and I can visualize it without issues.
- The text file has the following format:
```auto
NodeID PWP
1 100.0
2 105.5
3 110.0
...
```
**What I’ve tried:**
- I imported the text file as a table in ParaView and converted it to point data using the `Table to Points` filter.
- I tried using the `Append Attributes` filter to merge the PWP data with the VTU file but was not able to get the data mapped correctly.
- I checked that the Node IDs in the text file match those in the VTU file.
**Questions:**
1. How can I properly append the PWP data to the VTU file based on `Node ID`?
2. Is there a recommended workflow or filter that I might be missing to achieve this?
Any guidance or step-by-step instructions would be greatly appreciated! Thank you in advance for your help.
Best regards,
Abolfazl
---
### Author:  [@najafi](https://discourse.paraview.org/u/najafi)
#### Post date: [October 18, 2024, 11:10am UTC](https://discourse.paraview.org/t/how-to-append-node-based-pore-water-pressure-pwp-data-to-a-vtu-file-in-paraview/15540/2 "2024-10-18T11:10:09Z")
I’m still looking for a way to solve this issue. any help would greatly appreciated!
---
### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [October 18, 2024, 11:30am UTC](https://discourse.paraview.org/t/how-to-append-node-based-pore-water-pressure-pwp-data-to-a-vtu-file-in-paraview/15540/3 "2024-10-18T11:30:11Z")
It really helps to post data so that we can get a better idea of what is going on.
If I had to guess what is wrong, it might be that the rows in the text file do not match exactly the points in the .vtu file. The `Append Attributes` filter is going to ignore the `NodeID` field that comes from your text. You’ll have to sort the rows by `NodeID` and make sure all ids from 0 to N-1 are there. You will have to fill in any missing rows.