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Water through vessel - Two-way FSI

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Old   November 17, 2016, 11:54
Default Water through vessel - Two-way FSI
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Lucas Ribeiro
Join Date: Aug 2016
Posts: 23
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Hello guys,

I just started to use Ansys. I am trying to simulate a water flowing through a vessel. My problem is that a very strange thing is happening. The water is bending the vessel in a very strange way, please see the attached image. And also, why the fluid domain on CFD Post is not deformed (see link below)? Since the solid is deformed, the fluid domain should be deformed, right?

Vessel dimensions:
-This is a cylinder of height 0.05m, radius 0.005 and thickness 0.001.

Vessel material:
-Right now it just the default: Structural steel. Later, after everything is ok, I'll create an artery material.

Boundary conditions:
-Inlet is: I am using a UDF to generate a pressure pulse, see below.

 #include "udf.h"
 DEFINE_PROFILE(unsteady_pressure, thread, position)
    face_t f;
    real t = CURRENT_TIME;
    begin_f_loop(f, thread)

        F_PROFILE(f, thread, position) = t > 0.003? 0.0 : 1333.2;
    end_f_loop(f, thread)
- Outlet is pressure = 0.0

Time step is 5e-5

How come water is bending the steel??

Obs.: I am using ansys 16.2 and 17.1, both give me the same result.

Any help is welcome!


Deformed tube:

Fluid Domain on CFD Post

Last edited by Warlord; November 18, 2016 at 09:00. Reason: Adding image of the fluid domain using CDF-post
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Old   November 20, 2016, 07:35
Default Problem solved
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Lucas Ribeiro
Join Date: Aug 2016
Posts: 23
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Problem solved, everything is correct. The problem grew out of the fact that the image from Mechanical is very misleading. The visual deformation of the tube do not corresponds to the actual deformation.
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ansys., fsi, fsi 2-way coupling, two-way

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