Cidem Argunhan Atalay

Thank you soooo much BT :)

Dear BT,

did you solve the problem. I have to do same thing but I don't know how to do it. Dear Peter can you exlain the steps more detailed, please ?

Cidem

Dear all,

I will use FEFLOW to create 3D model for dewatering an open pit in a mine area. I will simulate the model for the mine life. As you know, pit depth and mine area always change, so how can define this elevation change for the mine life.  Can I define elevation as a temporal variation? I mean, I have weekly elevation contour belong to mine area. How can I define this weekly change to the model ?

Thank you
Çidem

Hi ,

I am modeling 2D unsaturated model. My model calculated pressure quite high and I couldn't see the water table. I read from the forum, the reason could be the difference between local and global coordinate difference. My extend in y direction is between 850-1440 meters, I shift the local coordinate to y=0 from the window shown in figure. Is this all for the transformation, I mean is there any steps should I perform for the transformation??
The problem is that when I re-run the model it gives a huge error amount, what can be reason. I think I have to do something with the transformation but I don't know what. In the forum I saw a link related with the transformation but it is broken. Please help me.

thanks a lot for the answer. As far as I understand FEFLOW does not derive saturation vs. releative conductivity, I have to define myself.

[quote author=Peter Schätzl link=topic=539.msg1289#msg1289 date=1231748717]
Using discrete elements, the fractures will be 'between' the layers (if you think about horizontal fractures). They will be reduced in the model to 2D. FEFLOW does not handle a double porosity approach, where the same layer has different properties for the fracture and matrix parts.
[/quote]

Dear Peter,

I try to model karstic area with FEFLOW. You allready wrote down that FEFLOW does not handle double porosity. I just wonder that if I enter the tabular data  for unsaturated media to represent double porosity, would't the results represent double porosed media. If I enter data in the attachment and use the spline model for unsaturated flow, does the results represent double porosed media ? Or do I have to define discrete elements for the karstic media everytime ?

Thanks a lot for the answer. I know that I can use Van genuchten method in FeFlow, what I ask is that what should I do if I have measured data. As far as I understand I can use spline models for this. The problem is I only have capillary pressure and saturation data. Does FeFlow estimate capillary pressure vs. relative conductiviy curve from the capillary pressure vs. saturation graph and saturated hydraulic conductivity ?

Hi everyone,

In FeFlow, I just started to model 2D vertical model. I have to model unsaturated flow. I have tabular data for saturation and capillary pressure head, so I will use spline approximation. The problem is I don't have any relative conductivity-saturation data. Before the FeFlow, I used another software which automatically estimates matric suction and hydraulic conductivity curve from  saturation and capillary pressure head. It uses Van-Genuchten and Fredlund-Xing methods to draw the unsaturated hydraulic curve from soil water content curve. Does FeFlow do such thing ? If not can you help me how I can calculate relative conductivity and saturation data.

thanks for the reply. I know the part you attached. What i see in the manuel is that I can enter total element number like in the figure. Is this changed ? And as far as i understand i need to assign mesh size differently for polygons and lines. Polygon size target means element size in the polygons, right ? However, when i change polygon target size from 5 meters to 20 meters there is no change in total element numbers, how is that possible ? And finally, when i change the mesh size or mesh type, all the selection (like boundaries or polygons that represents the certain formation) that I have made is cancelled, right ? Is it possible to lock these selections even the mesh size changes ?

Hi, I am quite new at FEFLOW. I have some problems with generating mesh. I am using FEFLOW 7 and total element drop-down part is missing. How can I enter total element number ? Also I didn't see the target element size part. There is polygon target size I think it is not the same with target element size. Also when I chose polygons seperately and change the proposed elements there isn't any change at the number of elements.