zheng

HI all,
I assigned 2nd type integral bC to a 3D steady flow model. My understanding is that the flux obtained in Budget Analyzer for the 2nd type BC should be proportional to the integral value I assigned. But it was not. It is very large when I assigned 0.01, and it was very small when I assigned 0.08. In one word, I cannot find a correlation between the value I assigned and the flux provided by the Budget Analyzer. Why is that? I appreciate any reply.

Zheng 

Hi,

The top slice of a confined aquifer has to be set as fixed?? Or it can be set as unspecified??

Thanks.

Zheng

Hi,

I assigned zero to the Transfer Rate In, but the Budget Analyzer still showed that flux in through 3rd type boundary conditions is much larger than 0 (like 400cubic meter per day). Why is that? Thanks a lot in advance for your reply.

Zheng

Hi,

For a steady flow/transient transport modeling, the contaminat source is a pond with very concentrated contaminant. If water is pumped out from wells surrounding the pond, the pond could be dry. How to represent the pond in the model? I tried using 1st BC, but it looks like it is not a good choice. When I use large pumping rate, there are always contaminant entering the subsurface. I appreciate any input for this.

Zheng

Hi,

For a steady flow/transient transport modeling, I set 3rd type BC for flow along a river. Do I have to set 3rd type BC for transport also along the same river? Thanks.

When I used the Budget Analyzer ->boundary to see how much water was pumped out from the wells, I found that there are values for both "flux in" and "flux out". But I only assigned pumping rate, and I did not assign any recharge rate to the wells. What is the reason for that?

Thanks a lot, Alexander.

Then what is the difference between multi-layer well and Standard Single well? For example, there are two cases.

Case one: I put Standard Single Well in the same (x,y) coordinates at Layer 3, 4 , 5, 6, and set the puming rate on Layer 6 as 100, and on the rest layers (i.e., 3,4,5) as 0.

Case two: I put multi-layer well in the same (x,y) coordinates as case one, and the puming rate on Layer 6 is 100, and on the rest layers (i.e., 3,4,5) is 0.

What is the difference between case one and two?

Thanks.

How to make changes (like the screen length) to mulyi-layer well once you assign it? Now I delete it first, and re-assign the 4th BC again. Is there any way not to delete it first? Thanks.

Qinghuai

Hi,

According to FEFLOW 5.3 User's Manual (page 181), to activate the function of Multi-layer wells, "you have to set the corresponding button in the Specific Options Settings... submenu of the shell's Options menu." And I tried that. I found that wether you set this or not, you can always use the multilayer well function. Is it a bug?

Regards,


Qinghuai

Hi,

One question about assigning pumping rate to wells. If I assign a pumping rate of 100 m3/d to slice 2, which layer does it mean that the water is extracted from, layer 1 or layer 2?

Thanks,


Qinghuai