Discussion Forum

To define 2D or 3D properties such as hydraulic conductivity on a domain Comsol gives you a variety of methods. For more details you should search about variables and expressions section in comsol help file.
The way I'm doing this, myself is through matlab. I first create in Matlab a struct variable such as K with three fields.
K.x=[coordinates in x direction]
K.y=[coordinates in y direction]
K.data=[values of your property] Note that this is not a 2D matrix but a 1D with length equal to length(K.x)*length(K.y).
Unfortunately i don't remember right now whether you should write the x values first or the y values, you could try both and see which one gives you the correct result.
Once you create the variable you can import it (at least in 3.5 I don't know about 4) by creating a new function then choose interpolation and use data from Matlab.

Then you can use the function you have defined. Let's say the function name is PERM, then you should give as value in the field of the property: PERM(x,y) if the property is 2d or PERM(x,y,z) in 3D case. Don't forget to make sure that the output of PERM function is always in [m/sec].

Good luck

Giorgos

Dear Giorgos,

Thanks a lot for all of your effort to answer to my question.
Actually I am very very new in COMSOL! and when I see that most of the users like and prefer to work with the 3.5 version I installed it today.
Please take a look on my data in attachment and see that is is possible I model the contaminant transportation via COMSOL in different times or not! you can see the data easily in MATLAB by imagesc(). The data are hydraulic conductivity.

Thanks again,
Pejman

Dear Giorgos,

Thanks a lot for all of your effort to answer to my question.
Actually I am very very new in COMSOL! and when I see that most of the users like and prefer to work with the 3.5 version I installed it today.
Please take a look on my data in attachment and see that is is possible I model the contaminant transportation via COMSOL in different times or not! you can see the data easily in MATLAB by imagesc(). The data are hydraulic conductivity.

Thanks again,
Pejman

Definitely Comsol can solve transient state transport models of many kinds.

I don't know if your problem has any peculiarities that Comsol cannot handle, however before solving your own problems I fully recommend you to go through the transport examples given by Comsol. They are very helpful to understand the Comsol way of thinking.

Giorgos.

PS. As for the data you attached, are you sure they represent hydraulic conductivity? there are many negative values.

Up to this time I am sure that COMSOL can handles my problem. My main problem is that COMSOL consider the hydraulic connectivity (HC) constant for all of the grid while I want that each grid have a specific value. Therefore, in other words I do not know that how I should enter the different values for HC!
Also the data are HC and I just scaled them into [-5 5]. Here is the original data.

Thanks for your help.