How to determine the direction of transport

[Yongqiang]

Hi Everyone,

How to determine the transport direction in a 3D simulator when coupling IPHREEQC and transport simulator?
For example, P1:(1,2,3), P2:(3,4,5) and P3:(6,7,8) are three points in the mesh. How to determine if the solution transport from P1 to P2 or from P1 to P3?

Best Regards,
Yongqiang

[dlparkhurst]

You have to solve the partial differential equations of flow. Basically, flow is in the direction of the gradient in head or pressure. You need basic texts in groundwater flow and numerical methods.

If you are asking this question, I am not sure why you are not using PHREEQC, PHAST, VS2DT, MIN3P, TOUGHREACT, or some other reactive transport program instead of developing it yourself.

[Yongqiang]

Hi Parkhurst,

Thank you for the advice.
It perfectly solves my question. So when moving the material from one node to the next node, the next node can be different if the direction of gradient changes. I think I am almost there.

Regards,
Yongqiang