Can anybody explain the meaning of DELV in GENER?
I'm not very clear about DELV and EX, can anybody help me?
thanks very much!
sawyer
8 replies
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Sawyer,
The DELV option essentially ties the production rate to the bottom-hole pressure. GX is your Productivity Index (PI). Equation 28 in the TOUGH2 User's Manual specifies how the flow rate of each phase is determined based on PI. EX is your set bottomhole pressure "at the center of the topmost producing layer in which the well is open." (from Appendix E of User's Manual, p. 175)
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Mikey Hannon
thanks for your replying!
Right now, i use the EOS3 to simulate the consolidating test, the top of the specimen is open boundary condition, when i set the volume of elements in uppermost layer is E50, the final results is not right, so i set DELV with a proper pressure, and it works well, i just don't know why?
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I'm afraid I don't fully understand what you were attempting based on your description. Could you explain the rest of your initial/boundary conditions?
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Mikey Hannon
I want to simulate the drainage test performed by Liakopoulos [Liakopoulos A C. Transient Flow through Unsaturated Porous Media.Dissertation of Doctoral Degree. Berkeley: University of California,1965] with EOS3, just a part of the fluid. A Del Monte sand column with 1 m in height and 0.1 m in diameter was used in the test, as shown in the following figure, a high-permeability sand stone was installed at the bottom of the column for support of the sample, together with an impermeable cylinder on the lateral surface.Before testing, a steady flow of water was supplied to the top end of the sample until water freely drained out from the bottom end and the entire sand column could be regarded in the fully saturated state. At the beginning of the experiment, the water supply to the top end was cut off. Afterwards, the pore water in the sand column gradually drained out from the bottom end by gravity, the sand column settled, and the unsaturated pore space of the sand would be filled with air.
During the experiment, the pore water pressures at different heights of the sand column, the accumulated volume of water and the transient flow rate through the bottom end were recorded.As for the lower boundary is open,should i assign very large volumes to the grid blocks of the lower boundary? I did this, but the result is not right!
Thanks again.
Sawyer
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I apologize for my delayed response.
There's actually an example problem in the TOUGH2 short course that is similar to this. In essence, you have to split this up into 2 parts.
- Calculate your initial conditions
- Place a large (or inactive) element on the top boundary consisting of 100% liquid water at 100% (or something close to it) porosity. You can set the permeability to match that of the sand column.
- Set your lower boundary as a large (or inactive) element at atmospheric pressure and air at whatever relative humidity setting is called for in your test.
- Run a simulation to steady-state, allowing gravity flood through the sample and saturate it.
- Run a simulation of the two-phase test
- Use the SAVE file from the test above as your INCON block for the inner domain.
- Replace your upper boundary with a large (or inactive) elements at atmospheric pressure and air at whatever relative humidity setting is called for in your test.
- Run this simulation to steady state, which will occur when the bulk of the water has drained through your sand column. Depending on your RPCAP settings, you'll likely preserve a slight amount of residual liquid saturation.
I apologize if you've taken this approach already, but this is how I would tackle it.
- Calculate your initial conditions
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Hello,
I'm a masters student just getting started using Tough2. I have no experience using this software so some of my questions will be real dumb but my advisor is very busy this week and I'm just suppose to familiarize my self with tough2. I have a little experience in eclipse so I know basics of simulation software. I'm trying to run some of the practice problems out of the manual. I only have EOS1 currently so I'm working on problem #3.
I just have no idea how to import the input file, and run the simulation. Is there a list of commands that can be typed into the command prompt window in the manual? I have tried to edit the diskfiles that are created (GENER, INCON,MESH etc.) but that does not seem to do anything either.
I'm basically just confused about how the files need to be arranged on the computer to allow for them to be read from the software. Thanks.
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Hi Ben,
Open a DOS Command Prompt window, go to the working directory (using command "cd") that contains the TOUGH2 executable as well as the input files, and type:
ToughEos1.exe < input_file_name > output_file_name
That's it!
Stefan
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Mikey Hannon
Thank you very much, it's a detailed answer, thanks again!
sawyer
