[COMSOL_Users] Fluid structure interaction help

[kmargaris]

Hello,

I'm new to Comsol. I'm trying to solve a FSI problem of a flow in a pipe with a flexible obstacle inside.
I have set up a model and while everything seems to be ok, the flexible obstacle remains undeformable.

The model I'm setting up is available online (Fluid structure interaction - Model 361). The only change I've made is the flow boundary conditions. I'm simply driving the flow with a pressure gradient.

I'm using comsol 4.0

Can anyone share ideas?

[h***@yahoo.com]

Hi, I am sorry that I ask a question, I want to solve a FSI problem ( like your modeling " just a simple vessel")
I did my modeling in ADINA, ASYS . but I dont know why I can do it in this software. I got warning about :
Warning: Inverted mesh element near coordinates (8.40417, -16.2534, -2.0621).
and finally diverging. :(



---In ***@yahoogroups.com, <***@yahoogroups.com> wrote:

Hello,

I'm new to Comsol. I'm trying to solve a FSI problem of a flow in a pipe with a flexible obstacle inside.
I have set up a model and while everything seems to be ok, the flexible obstacle remains undeformable.

The model I'm setting up is available online (Fluid structure interaction - Model 361). The only change I've made is the flow boundary conditions. I'm simply driving the flow with a pressure gradient.

I'm using comsol 4.0

Can anyone share ideas?

[Jay A. Puckett]

If you are using ALE, look carefully at the mesh with time in the area cited.

From: ***@yahoogroups.com [mailto:***@yahoogroups.com] On Behalf Of ***@yahoo.com
Sent: Saturday, November 02, 2013 2:30 PM
To: ***@yahoogroups.com
Subject: [COMSOL_Users] RE: Fluid structure interaction help



Hi, I am sorry that I ask a question, I want to solve a FSI problem ( like your modeling " just a simple vessel")

I did my modeling in ADINA, ASYS . but I dont know why I can do it in this software. I got warning about :

Warning: Inverted mesh element near coordinates (8.40417, -16.2534, -2.0621).
and finally diverging. :(


---In ***@yahoogroups.com<mailto:***@yahoogroups.com>, <***@yahoogroups.com<mailto:***@yahoogroups.com>> wrote:
Hello,

I'm new to Comsol. I'm trying to solve a FSI problem of a flow in a pipe with a flexible obstacle inside.
I have set up a model and while everything seems to be ok, the flexible obstacle remains undeformable.

The model I'm setting up is available online (Fluid structure interaction - Model 361). The only change I've made is the flow boundary conditions. I'm simply driving the flow with a pressure gradient.

I'm using comsol 4.0

Can anyone share ideas?

[Bernard]

Can you send me the model - clear meshes and solutions before you send it to keep the file size small


Bernard
Sent from my iPhone so please excuse the spelling!"

Post by h***@yahoo.com
Hi, I am sorry that I ask a question, I want to solve a FSI problem ( like your modeling " just a simple vessel")
Warning: Inverted mesh element near coordinates (8.40417, -16.2534, -2.0621).
and finally diverging. :(
Hello,
I'm new to Comsol. I'm trying to solve a FSI problem of a flow in a pipe with a flexible obstacle inside.
I have set up a model and while everything seems to be ok, the flexible obstacle remains undeformable.
The model I'm setting up is available online (Fluid structure interaction - Model 361). The only change I've made is the flow boundary conditions. I'm simply driving the flow with a pressure gradient.
I'm using comsol 4.0
Can anyone share ideas?

[h***@yahoo.com]

Sorry I saw your reply lately.
my change my simulation to a very very simple simulation.
I should say that I did a FSI project in both ADINA an ANSYS software but I dont kno why I could not converge simple simulations in COMSOL software.
It is a simple simulation. The fluid domain is a 2D rectangular in which one of sides is open boundary and the others are wall. One of walls moves inside and I expect that with moving of this wall flow would be pushed out. I do not know why this problem has never converged.
For simulation this problem:
I defined prescribed mesh velocity for moving wall (in deformed geometry)
And I defined wall (moving wall) (in Laminar flow)
Please if you have any tips about my problem, help me to solve it.
Thank you
Hamidreza Rajabzadeh