Re: Re: model the underground water surface

Hi,

I am also not sure about that. What I know is that if
you use 
*sflow
 watersurface,QD,ks(Defining drainage-only flow)
Then the watersurface will have water pressure = 0.
However, I am so sure about that. Maybe you can try
simple model, and see the result.

Darwid Halim



--- mechanics007 <mechanics007@xxxxxxxxxxxx> wrote:

> 
> 
> Dear Halim
> 
> Hi
> 
> Thanks a lot!!!!
> 
> I have looked into the ABAQUS/Standard,and it is
> writed " Drainage-
> only flow type labels QnD and QD are used on the
> data lines of the 
> *FLOW and *SFLOW options, respectively, to indicate
> that normal pore 
> fluid flow occurs """"only from the interior to the
> exterior region 
> of the model.""""
> 
> So if the outward direction of surface is rightly
> defined from ground 
> to ground water surface,I think 
> *sflow
> watersurface,QD,ks(Defining drainage-only flow)
> can really do this. Is that right?
> 
> Best regards
> Xuhan
> 
> 
> --- In ABAQUS@xxxxxxxxxxxxxxx, Darwid Halim
> <acin_lim@xxxx> wrote:
> > 
> > Hi,
> > 
> > If you use 
> >   *sflow
> >    watersurface,QD,ks(Defining drainage-only flow)
> > Then, it means the ground water will flow to the
> > surface. It is quite strange. Since what you want
> is
> > the rainfall into the ground surface, not vise
> versa. 
> > 
> >   *boundary
> >    watersurface,8,,0.
> > If you use that one, it is just a boundary
> conditions
> > that watersurface pore water pressure is zero all
> the
> > time. 
> > 
> > I am not so sure which one should you use.
> However, I
> > know there is one example about how to use *sflow
> from
> > ABAQUS. You go to the help file and then search
> for
> > benchmark example. Over there there is an example
> with
> > dam. Take a look that example. May be it can help
> you.
> > 
> > Darwid Halim
> 
> 
> 
> 
> 
> 
> 
> 



                
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