representing an oven using extra cell
I’m trying to use TOUGH2 to history match a column test where some soil was put inside a glass column and sealed and then put the column itself inside an oven set at some elevated temperatures. The oven and column's temperatures were recorded. Now, I have defined a mesh to represent the column and the soil inside. However, I wonder what the best way is to represent the oven and it heating rate? I thought I would define a very thin layer around entire the mesh set at oven's temperature to represent it, but this would lead to a very large number of gridblocks and potentially long simulation run time. Then, I said it might be best to represent the oven using an "extra cell" or "dummy cell" connected to all the actual side gridblocks in the domain as in the petrasim's manual. However, the problem is how to define the extra cell connections given it is supposed to be connected to all the boundary gridblock in the domain. Any suggestions would be greatly appreciated.
You could use program AddBound (the Fortran source code can be downloaded from http://www.finsterle-geoconsulting.com/download) to easily connect a single heater element to the outer surface of your model domain.
I hope you have good reasons to use a full 3D model to simulate and match your experimental data. If your test is axial, a 1D model would suffice; if your test is radial (e.g., heating from the outside), a 2D, radially symmetric model (easily generated by TOUGH2's MESHM option RZ2D) would suffice. Only if your data and processes are truly 3D would you need the model you show in your figure.
Thanks Stefan, much appreciated. To physically represent the actual experiment given I had multiple sensors inserted into the column, I decided to use a 3D domain. However, I could still use a quarter of the domain instead of the entire volume assuming a perfect homogeneity in the material inside the column.
Thanks stefan. I just need clarification with regards to 2D RZ axisymmetric model. Let say I have an injection rate of a fluid into a well in a reservoir. Now I would like to model that injection well using a 2D R-Z mesh. As the 2D radially symmetric mesh is only a 2D slice, my question is: Do I need to scale down the injection rate in a 2D R-Z mesh or should I inject the full rate the same as in the actual well? Are the results are reported for a full cylinder (doughnut-shaped cells around the center of the model) or just for that 2D slice?