A Geoelectrical Forward Problem
Application ID: 9636
The classical forward problem of geoelectrics (includes electrical resistivity tomography, ERT and earlier techniques as vertical electric sounding, VES) is the calculation of potentials at a given set of electrodes (M,N) while current is injected at other electrodes (A,B) into the ground.
Typically the physical domain (earth) is unbounded to the sides and the bottom because of which one needs to care for modeling infinity at the computational domains.
This model describes the 3D ERT forward problem for 25 electrodes in a homogeneous ground of 100 Ohm-m and compares it to the analytical solution. An extension covers the switching of electrode configurations and the calculation of sensitivity.
This model example illustrates applications of this type that would nominally be built using the following products:AC/DC Module
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.