×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

coupled pore fluid diffusion stress analysis

coupled pore fluid diffusion stress analysis

coupled pore fluid diffusion stress analysis

(OP)
Hello all,

I am modeling single element in SOILS.

I am new to ABAQUS and spent time browsing through forum , but could not find the answers. I would appreciate if you could help me solve this.

model is single element, c3d8p, bottom surface fixed. triangular load applied on top surface. and pore preesure -0 defined on top surface.

1. my 1 element model runs but it gives warning "There is zero VOL. FLUX everywhere in the model based on the default criterion. please check the value of the average VOL. FLUX during the current iteration to verify that the VOL. FLUX is small enough to be treated as zero. if not, please use the solution controls to reset the criterion for zero VOL. FLUX."

I this a problem? Am I getting my answers correct in simulations even though if I am getting this warning. permeability value is of the order E-11 .

2. How to calculate total fluid loss from the element? I understand RVF and RVT gives it. But then what happens when load is removed? does the fluid comes back inside the element? Void ratio is fixed. and saturation is 1.

3. Why is saturation remaining constant when fluid flows out?

4. Does the volume of element change when load is applied? My model shows constant volume of whole element. If water flows out, it should change.. right? Or, how can i explain this phenomenon?

I would greatly appreciate, if someone can help sort me this doubts. thanks.

RE: coupled pore fluid diffusion stress analysis

(OP)
5. Also, how to calculate what fraction of load is carried by liquid and solid phase?

6. should I use pore fluid flow in my analysis? what is significance of pore fluid flow? Or, in other words , when should I apply it?


thanks.

RE: coupled pore fluid diffusion stress analysis

a) Let me repeat, please do not tag in the forums. It is an unfair practice and can get you kicked out.
b) Although I've used Soils analysis before, I am no expert. So, please take these with a pinch of salt:

1. Make sure your units are consistent. And then, check them again.
2. What makes a fluid move?
4. If you are using a hybrid element, then the volume of the element will not change. Otherwise, it will.
5. I do not remember off the top of my head but I do recall that it is discussed in the Analysis User's Guide (or, perhaps, the Theory Guide). If you can not find it, ask again.

I do not know the answer to the rest of your questions. Perhaps, you should try Yahoo! Groups and LinkedIn. However, just so you are aware, do your homework (reading manuals, for instance, is expected) before you post anything - anywhere.

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources