ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
(OP)
I have a cylinder set up, and I want to model the leakage of the air inside the cylinder into the environment and monitor the pressure on the walls. Problem is, when I set up the interaction, I have an error of
TWO REFERENCE NODES MUST BE SPECIFIED ON THE DATA LINE OF THE *FLUID EXCHANGE KEYWORD
I have two interaction properties specified, namely the cavity in the cylinder with one reference point inside, as well as defined the internal surface of the cylinder. The other interaction property is the fluid exchange with the bulk modulus specified.
Problem is when I set up the fluid exchange interaction to 'with environment', there is no other place to specify a second reference node. I don't know how to get around this because I can't put two ref. nodes, and I get the error message if I don't.
Attached is the image of the interaction 'with environment'.
TWO REFERENCE NODES MUST BE SPECIFIED ON THE DATA LINE OF THE *FLUID EXCHANGE KEYWORD
I have two interaction properties specified, namely the cavity in the cylinder with one reference point inside, as well as defined the internal surface of the cylinder. The other interaction property is the fluid exchange with the bulk modulus specified.
Problem is when I set up the fluid exchange interaction to 'with environment', there is no other place to specify a second reference node. I don't know how to get around this because I can't put two ref. nodes, and I get the error message if I don't.
Attached is the image of the interaction 'with environment'.





RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
http://127.0.0.1:2080/v6.13/books/usi/default.htm?...
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
For sure if you want to define fluid exchange between your fluid cavity and environment
you need to use only one reference node in *FLUID EXCHANGE keyword.
Check Abaqus documentation:
Abaqus Analysis User's Manual, 11.5.3 Fluid exchange definition, Flow between a single cavity and its environment.
User interface for fluid cavity in Abaqus/CAE is new. As I know 6.12 is first version with this feature.
Perhaps it is a bug in Abaqus/CAE. Try update your inputdeck manually with any text editor.
Regards,
Bartosz
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
I followed the user manual at every step, but it just doesn't mention anything about having two reference nodes. I'm thinking of just making a huge tank to act as the "environment" for now just so I can get the project moving along.
It doesn't help that the new interface for posting questions to Dassault is extremely un-user-friendly.
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
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http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
I have a fluid cavity inside a cylinder (Interaction Property cavity, Interaction first cavity), the fluid exchange with environment (Interaction Property exchange, Interaction Int-2). I don't have a second cavity (funnel cavity is suppressed).
In Interaction first cavity it only allows me to pick one Reference node, which is subsequently used in Int-2. I tried doing a fluid exchange interaction between two cavities (each with a reference Cavity point) and it worked, it just doesn't work for 'To environment' because I can't select two nodes.
I even tried creating a set with two reference nodes, but it doesn't show up in the list of eligible sets when I try to select a fluid cavity point in first cavity.
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
**
** Interaction: Int-2
*Fluid Exchange, name=Int-2, property=exchange
_PickedSet42
** Interaction: first cavity
*Fluid Cavity, name="first cavity", behavior=cavity, refnode=_PickedSet42, surface=Part-1-1."cup inner surface",
ambient pressure=2e+07
the refnode specified in *Fluid Cavity has only one node inside, as I explained before I can't make it show up when I pick a cavity point.
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
I was surprise a little bit your problem since I am using *FLUID EXCHANGE with one ref. node a lot at it always works.
I took a look for Simulia Knowledge Base and found bug report BR10000128140:
So I am guessing you are using Abaqus/Standard where I am using Abaqus/Explicit.
Regards,
Bartosz
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
Otherwise, based on whatever I've done so far, should it theoretically work in Explicit?
RE: ABAQUS 6.12 Fluid exchange with environment interaction requires two nodes?
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083