manu-al

Hey you model-pro´s out there,

for the most of you this could be a very easy question, but right now I cannot explain it to myself:

I have a density-driven transport model (steady flow, transient transport) for which I calculated a steady-state hydraulic head and implemented it as initial conditions. As I would consider my model should use this stable flow-conditions for the further calculations and shouldn´t calculate the flowfield in every step.

but when I run it, the flow-field changes in every step and also is continiously calculated... Am I thinking the wrong direction? In density-driven transport, there cannot be steady state flow conditions, when densities are changing in time, can they?

If steady state flow is possible for my problem here, how can I implement it in Feflow?

thx a lot for discussion,

model on :)

Hey there,

once again a more or less general question:

i have nodes with flow boundaries (1st order), and exactly these nodes should get a transport boundary condition, too... i tryed with join function, but with "mesh" it dont work and also with *shp import or something else feflow tells me, that there are no lines in the file i wanna open....


so, in which format I need to export the flow boundaries in order to import it in transport boundaries?? is this possible at all? i mean i have about 500 nodes which i don`t want to attribute by hand....

thx a lot!! 

Dear Peter,

thanks a lot, I`ll try it this way....  :)

Hi you model-folks, I love this forum :)

I have a simple question I think, but cannot get an result for my own: i did differences for two different time stages, everything went fine... but how can I get this distribution into the preprocessor as a reference? in the reference section I cannot import a shape-file, but I can interpolate from feflow triplets, which takes severals minutes...

isn`t there a better way to get results from the postpro simply in the preprocessor without interpolating nodes etc.?

I also need this distribution (differences) in the feflow explorer, so a reference distribution would be the best, wouldn`t it?

model on :)

Manuel

Thx a lot, yes this problem seems to get better, the more refined the mesh gets.... time to calculate is more than one week I guess, so better in 2d...

Hello out there,

I have a problem in modeling the expansion of saltwater... first to my modell (feflow5.2):

I have time controlled disposal wells, without any casing, so the screen is about 300 m through seven slices of my model. In the Flow-boundaries I put the injection-rate (via timecurve xy) in slice 1, all other slices have a well at that special node, but without any injection rate.... I do use well bore conditions, so the well is linked and the flow is functional in all slices...

so far

but now I want to update this model for [b]transport of saltwater[/b]... In the problem class I`ve choosen "flow and mass transport",  "single species", so my Species is NaCl.... 

I´ve entered a background or better an initial concentration of about 13000 mg/l (this area is outside europe, the values are save, believe me) for the whole model area, one border is a coastline, there i`ve put an average value of 45000 mg/l...

now for the disposal wells I have checked serveral different input methods and alternatives. first of all the water injected to the aquifer has a TDS of about 150000 mg/l, so the concentration should rise and rise and rise in the ambience of the wells but what happens: from slice 3 to 7 there is a negative concentration given after the run (-12000 mg/l for example)... in one slice (sl2) there is a little positive fringe, showing that some of the high concentration water is really injected, but in all layers below the concentration is < 0 mg/l !!??? ...  can somebody think of a soultion?? i cannot explain it to myself..... i would think the high-concentrated water should sink through the aquifer, shouldn´t it? by the way, this should be the aim of my model, showing where the flowpaths are going from this injection points... but density- and concentration-coupled...

or somebody knows a tutorial 'bout that? [move]gerne auch auf deutsch ;)[/move]

regards!
AL