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-   -   X Flow CFD? Will you use it? (http://www.cfd-online.com/Forums/main/83457-x-flow-cfd-will-you-use.html)

HarshThapar December 29, 2010 16:57

X Flow CFD? Will you use it?
 
Hi, I came across X-flow cfd , a new mesh less, particle based , new fully lagrangian approach to fluid simulation ( link below)

I want to know how it compares to a mesh based software like say CFX or Fluent? Capability, suitability and accuracy?

http://www.nextlimit.com/techno_cfd.php

j_smith January 17, 2011 13:38

Hi Harsh,
We have evaluated XFlow 2011 in our company for several weeks and are quite satisfied with the results.
We are simulating airflow around civil structures. The software is easy and intuitive to use, results are reasonable and it has nice postprocessing capabilities. The main pro is that the meshing process is avoided, saving a lot of time. Main cons so far are that it only runs under Windows 64 OS, and analysis must be transient.
http://www.xflowcfd.com/

Med August 5, 2011 18:47

XFlow
 
Hi,
Xflow is very easy to use. a little bit less accurate then CFD based Navier-Stockes-Equation (like CFX, Fluent, StarCD, ...) but more flexible. very good for complex geometry and moving parts. Xflow use the Lattice Boltzmann method and Lattice Gas Automata Mesh-less approach. Work only on 64-Bit OS and Only transient calculation can be made.

CFDfan July 20, 2012 12:45

Quote:

Originally Posted by Med (Post 319094)
Hi,
Only transient calculation can be made.

How do you know for how long to run the transient simulation? Are there any flags in the software when the process reaches the stable-state condition

TrinoM August 6, 2012 08:13

It looks like their version 2012 of XFlow includes now a Linux version, according to the hardware requirements page: http://www.xflowcfd.com/index.php/pr...w/requirements

Concerning accuracy, it doesn't look bad at all if checking their white papers posted, e.g.: http://www.xflowcfd.com/pdf/Paper03-...Prediction.pdf.

I read lattice-Boltzmann was fast for transient simulations. The pseudo-steady state of transient simulations can usually be checked by different parameters depending on your application, e.g. convergence of the forces in aerodynamics. This isn't very different from looking at a residual curve to go down.

I would give it a try.

sana December 21, 2012 13:18

importing adams motions to xflow
 
Hi
i start to learn xflow. i have worked a lot with adams but now i need to study motion of a body in a 3d domain of a fluide. i want to simulate a motion in adams and then transfer it to xflow. in adams i first simulate motion then exported my body in step format and then export results file . in xflow i import step and results files. i saw my model shape and its motion but when i run xflow i can't see any interaction between body and fluide. also py diagram in function viewer remain zero but my shape move! note that after importing body , xflow knows it as a enforced geometry.
i do not know what should do to perform a correct importing from adams to xflow can any body help me to do that
GOOD LUCK

sana December 23, 2012 13:13

Quote:

Originally Posted by sana (Post 398600)
Hi
i start to learn xflow. i have worked a lot with adams but now i need to study motion of a body in a 3d domain of a fluide. i want to simulate a motion in adams and then transfer it to xflow. in adams i first simulate motion then exported my body in step format and then export results file . in xflow i import step and results files. i saw my model shape and its motion but when i run xflow i can't see any interaction between body and fluide. also py diagram in function viewer remain zero but my shape move! note that after importing body , xflow knows it as a enforced geometry.
i do not know what should do to perform a correct importing from adams to xflow can any body help me to do that
GOOD LUCK

help me some body PLEASE

wangguobin14 March 5, 2013 04:59

very good for complex geometry and moving parts
 
sana
hello, now i am very good at xflow for genaral model,then with adams will be my work award step,so,do you mind let me do something for you.please keep touch with wangguobin14@163.com,ths
Quote:

Originally Posted by sana (Post 398795)
help me some body PLEASE


sana March 12, 2013 12:56

hi
i will be glad to connect with you
i worked a lot with xflow but at last i cant give suitable answers from it i am professional in adams and i wanted to combined xflow and adams but i couldn't i have bellow problems with xflow can you help me to solve them

1- when i import a adams model into xflow it converts it to an in-force body and when i run a simulation, motion of the body doesn't have any affect on fluid. then how can i do this import well? do you know?

2- in free surface simulation :

when i give a motion to the water container xflow can't simulate water motions (for example can you simulate a falling bottle or a moving container?

when i want to import a fuel tank model from solid work (it contains internal baffles and walls) xflow stops and show an error associate with its 3dengine)

3- i cant obtain a correct answers in supper sonic problems especially in zero degree pitch angles

mecobio August 12, 2013 11:22

Quote:

Originally Posted by j_smith (Post 290815)
Hi Harsh,
We have evaluated XFlow 2011 in our company for several weeks and are quite satisfied with the results.
We are simulating airflow around civil structures. The software is easy and intuitive to use, results are reasonable and it has nice postprocessing capabilities. The main pro is that the meshing process is avoided, saving a lot of time. Main cons so far are that it only runs under Windows 64 OS, and analysis must be transient.
http://www.xflowcfd.com/


Hi j_smith, sana and others

Is there any possibility to someone to put out there a X-flow project, available as an example, to see how it works?, since I do have access to a X-Flow for few days and I want to see how it works. Unfortunately, no time to create an entire new project from scratch. It doesn't matter how simple the X-flow project is, it is just to see how X-flow works.

Thanks :) mecobio [ AT] hotmail.com

PS: It is strange that there is NO single example with that X-flow code.


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