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elg0086

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  1. elg0086

    ChemPlugin Setting Units

    Brain, Thank you for the response. I am currently using the first approach you mention, but your second suggestion is also intriguing and will prove useful in the future. Thank you! Regards, Erik
  2. elg0086

    ChemPlugin Setting Units

    Brian, Thank you for the response and I apologize for any ambiguity. The solution leaving the last node of the domain is transformed prior to looping back to the first instance. Within this loop sulfuric acid is added to achieve a target concentration of 10 g/l (sulfuric acid). However, the mass required to achieve this concentration is an unknown and controlled by reactions within the domain. Currently, I have a separate instance linked between the last node and first node to allow for this transformation. However, I have not quite figured out the best method to determine the difference between the final node and target chemistry (H+ and SO4--), and then configure the "transformation" instance to reflect this difference. Regards, Erik
  3. elg0086

    ChemPlugin Setting Units

    Brian, I have a question which builds on the topic found here: https://forum.gwb.com/index.php?/topic/2483-chemplugin-pore-volume-pv-and-extendrun/&tab=comments#comment-6328 Part of my model uses the output solution from the last instance and "loops" it back to the first instance. I was hoping to adjust the pH and sulfate entering the first node based on the output concentrations from the last node. However, calling the cp.Config command within a time marching loop is not possible (I expected this would not be possible). I would like to confirm that the "cp.Config" command will not run within a time marching loop. Another option I explored was running my model in "stages" using the "extend run" command. According to the aforementioned forum topic, kinetic minerals present within an instance will reset after calling the "extend run" command. Currently I have one kinetic mineral but will possibly be adding up to eight additional minerals. Furthermore, sorption and precipitation will be enabled, presenting a daunting task to reset each instance with concentrations and mass from the previous day. Currently, I have a work-around model involving an instance with a sliding pH that might achieve 90% of what I am attempting to simulate. In summary, to what extent can the chemistry of a system be dynamically altered in a time marching loop? In other words, is it possible to actively read and write input/output chemistry during a simulation? Thank you for your time! Regards, Erik
  4. elg0086

    Results command ChemPlugin

    Melika, Looking at the output text now, it makes sense to spell out the element since it is printed as such. Most of the literature provides examples of aqueous solutions (H+, Fe++) and I was just using Cu and Fe as the element name. Thank you for clarifying the syntax. -Erik
  5. Hi, I am attempting to retrieve results in ChemPlugin using the command my_result = (cp[nx - 1].Report1("concentration elements fluid", "moles")) Is there a way to point to a specific element (scaler value) using a variation of this command line? i.e. my_result = (cp[nx - 1].Report1("concentration elements fluid Cu", "moles")) Thanks. Regards, Erik
  6. elg0086

    ChemPlugin Setting Units

    Brian, Thank you for the response as it cleared up some of my questions. I'm still getting my head around the workflow of Chemplugin with python as the client so I imagine I will have more questions in the future. Thank you. -Erik
  7. Brian, I apologize if the answer to this question is already posted in the manual but I could not readily find it. How do you set units for the simulation parameters? The images below are from two different tutorials and neither directly sets units but references them differently with # meters or # cm. Also, this link appears to be broken: https://academy.gwb.com/RTM1.py Regards, Erik
  8. elg0086

    Script for X2t

    Hi, I have been working on an X2t model and would like to add a script to an aqueous species in the reactants pane. I am using a recirculating well (located in the last node) to re-inject solution into the first node. Is there a command to reference an aqueous species concentration in the recirculating fluid at the end of each time step? More specifically, I am trying to determine a species concentration of the recirculating fluid at each time step and then adjust to a desired concentration for the start of the next time step. I do not want to fix the activity of the species since I am allowing for reactions along the flow path. Conceptually, I'm interested in mineral dissolution by an acid in a closed loop column with small additions of acid to maintain a constant starting acid concentration. Thank you! Regards, -Erik
  9. Hi, When a mineral precipitates in an X2t or X1t node, is it capable of redissolving if the system changes later in the simulation? Is there a way to remove precipitated minerals from the system? From what I understand porosity will reflect any changes in dissolution and precipitation. Thanks, -Erik
  10. elg0086

    Recirculation in X1t

    Brian, Thanks for the response. Hopefully, this feature can be incorporated into a future release. I am currently working on a closed-circuit series leaching test and modeling in X1t is a time saver. -Erik
  11. In X1t, is it possible to recirculate a solution from the final node, in other words use the final node solution as an inlet solution? Thank you. -Erik
  12. Hello, As per GWB documentation found here: https://academy.gwb.com/reaction_kinetics.php The built-in kinetic rate law is defined as: where aj, mj are the activity or concentration of promoting or inhibiting species, How does GWB determine which speices to include as promoting or inhibiting? Thank you. -Erik
  13. elg0086

    Raffinate Solution X2t Model

    Melika, Thank you for the response. You are correct in that several of these minerals would not be stable in the system but we are anticipating rapid dissolution. I have since edited the mineral composition (removed anorthite and magnetite for simplicity) and adjusted the partial pressure of oxygen in the model (which was not set correctly). The Inlet fluid (groundwater) was sampled on site and analyzed by a commercial lab. The raffinate chemistry was provided by the manufacturer. Both solutions have been balanced using specE8. The model appears to be having trouble with the initial basis. Should mineral volumes be part of the reactants pane instead of the initial basis? Thank you. -Erik
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