|
[Sponsors] |
May 12, 2024, 10:16 |
Speed settings for mesh nodes
|
#1 |
New Member
Evelyn
Join Date: Mar 2021
Posts: 20
Rep Power: 5 |
In the literature, the patient's MRI data is read and the velocity value of the entrance at each moment is obtained. How to assign the values of different grid nodes at various times to the corresponding grid nodes in cfx as the entrance boundary? Any ideas?
[1]Pirola, S., Cheng, Z., Jarral, O.A., O’Regan, D.P., Pepper, J.R., Athanasiou, T., Xu, X.Y., 2017. On the choice of outlet boundary conditions for patient-specific analysis of aortic flow using computational fluid dynamics. J Biomech 60, 15–21. https://doi.org/10.1016/j.jbiomech.2017.06.005
__________________
biofluid mechanics;Hemodynamics |
|
May 12, 2024, 18:10 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,729
Rep Power: 143 |
I assume you are trying to apply a varying boundary condition, where the value of the boundary condition varies in space (so across the boundary condition) and time.
You will probably need a user fortran routine to do this. This will give you complete control over your boundary condition. It is not easy to do, so read the CFX documentation on user fortran carefully, and look at the examples it gives.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
|
May 12, 2024, 22:59 |
|
#3 | |
New Member
Evelyn
Join Date: Mar 2021
Posts: 20
Rep Power: 5 |
Quote:
__________________
biofluid mechanics;Hemodynamics |
||
May 12, 2024, 23:43 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,729
Rep Power: 143 |
In user fortran you can program it to do whatever you want - assuming you are a good enough programmer to work out how to do it. As I said, have a look at the CFX documentation on user fortran and see what it looks like to you.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
|
May 13, 2024, 00:30 |
|
#5 |
New Member
Evelyn
Join Date: Mar 2021
Posts: 20
Rep Power: 5 |
Ok, thank you! I will try to learn the user fortran.
__________________
biofluid mechanics;Hemodynamics |
|
May 13, 2024, 10:57 |
|
#6 |
Senior Member
Join Date: Jun 2009
Posts: 1,815
Rep Power: 32 |
A lot of people tend to confuse things when using discrete data, and you seem to be doing so as well.
Your discrete data already has its own spatial and time grid/mesh. To deal with it, you can use UserFortran to organize and manage your data. However, keep in mind the mesh for discretization is NOT the same mesh for the discrete data --> there is a mapping to be done. Who is responsible for the mapping between "discrete data mesh" and "solution mesh" -> UserFortran programmer either with local tools or with existing API if the exist. One thing you can do is to use the mapping tools to map your "discrete data" to the "solution mesh" for each time step manually, and let the User Fortran work on the "mapped data" instead. You should read how to use Ansys CFX .csv files, how they are loaded into CFX-Pre, how they can be transformed/edited/mapped and how that can help you simplify your tasks.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
|
May 13, 2024, 11:31 |
|
#7 | |
New Member
Evelyn
Join Date: Mar 2021
Posts: 20
Rep Power: 5 |
Quote:
https://www.youtube.com/watch?v=NjiO9_wizzo
__________________
biofluid mechanics;Hemodynamics |
||
May 14, 2024, 04:05 |
|
#8 | |
New Member
Evelyn
Join Date: Mar 2021
Posts: 20
Rep Power: 5 |
Quote:
__________________
biofluid mechanics;Hemodynamics |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
SIMPLE algorithm | SamR | Main CFD Forum | 19 | April 26, 2019 13:06 |
Reducing the number of nodes | Elena T | Mesh Generation & Pre-Processing | 0 | July 6, 2017 14:41 |
32 Cores Mini-Cluster, 2 Nodes vs. 4 Nodes performance | Courageous | Hardware | 3 | July 7, 2016 11:37 |
Write speed with CFX using 2 nodes and 1gbps ethernet | kjetil | Hardware | 0 | February 3, 2016 08:10 |
CFX4.3 -build analysis form | Chie Min | CFX | 5 | July 12, 2001 23:19 |