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I read this background article the other day: However, if anode flux boundary conditions had been chosen initially, switching to fixed voltage boundary conditions by set-stack-voltage command and then back to fixed current boundary conditions by the set-stack-current-density command will then have flux boundary conditions on the cathode side. I am facing a new situation today: John is working in a laboratory. He has a device that he is working on. Part of his job is to figure out what kind of boundary conditions to use for the device. Using the knowledge I acquired from the background article, how should I answer the following question regarding my new situation: Given John chooses anode flux boundary conditions initially, what will he need to do to get back to fixed current boundary conditions?
set-stack-current-density command
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "In this case, using the set-stack-current-density command exclusively will preserve the anode flux boundary condition setting. 18.2."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Using the Fuel Cell and Electrolysis Text User Interface All of the features for the Fuel Cell and Electrolysis Model (sometimes referred to as the Resolved Elec- trolyte model) that are available through the graphical user interface are also available through text user interface (TUI) commands."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The TUI allows text commands to be typed directly in the ANSYS Fluent console window where additional information can be extracted and processed for more advanced analysis."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Once the fuel cell module is loaded (see Loading the Fuel Cell and Electrolysis Module), you can access the text user interface through the console window under define/models/resolved-MEA-fc/. A listing of the various text commands is as follows: resolved-MEA-fuelcells/ Fuel cell model menu."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "advanced-setup/ Advanced setup."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "contact-resistivity Set contact resistivity."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "coolant-channel Set coolant channel. list-zones-briefly List zone names and IDs."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "stack-management/ Stack setup. create-fc-unit Create fuel cell unit."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "delete-fc-unit Delete fuel cell unit."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "list-fc-units List fuel cell units."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "list-zones-briefly List zone names and IDs."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "modify-fc-unit Modify fuel cell unit. 389 Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Using the Fuel Cell and Electrolysis Text User Interface reset-setup Reset the stack setup in case mistakes are made."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "set-stack-current-density Set the current density on the anode or cathode and modify the current solution to assist convergence."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Note:"
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Input here is in units of A/cm2.This is only available if the case contains valid data (for example, after initialization, iterating, or reading in data)."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For more information, see IV-Curve Calculations Using the Text Interface (p. 391)."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "set-stack-voltage Set the voltage difference in Volts between the anode and the cathode and modify the current solution to assist convergence."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "This is only available if the case contains valid data (for example, after initialization, iterating, or reading in data)."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For more information, see IV-Curve Calculations Using the Text Interface (p. 391)."
3
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "submit-setup Submit the stack setup and makes the stack setup take effect."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "suggest-setup Suggest the stack setup, invoking the automatic stack setup."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "anode-setup/ Anode setup."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "catalyst-layer Set catalyst layer."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "current-collector Set current collector."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "electrolyte-layer Set electrolyte layer. flow-channel Set flow channel."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "list-zones-briefly List zone names and IDs."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "porous-electrode Set porous electrode."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "cathode-setup/ Cathode setup."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "catalyst-layer Set catalyst layer."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "current-collector Set current collector."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "electrolyte-layer Set electrolyte layer."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "390 Fuel Cell Text Commands flow-channel Set flow channel. list-zones-briefly List zone names and IDs."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "porous-electrode Set porous electrode."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "electrolyte-setup/ Electrolyte setup."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "catalyst-layer Set catalyst layer."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "current-collector Set current collector."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "electrolyte-layer Set electrolyte layer. flow-channel Set flow channel."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "list-zones-briefly List zone names and IDs."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "porous-electrode Set porous electrode."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "enable-fc-model? Enable/disable fuel cell model. model-options Model options. model-parameters Model parameters."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "reports Set electrolyte project area and external contacts."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "select-model Select model. set-default Set default."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "18.2.1."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "IV-Curve Calculations Using the Text Interface For valid case and data files, there are two text commands available to assist in the IV-curve calculation."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "These commands are set-stack-voltage (aliased as ssv) and set-stack-current-density (aliased as ssc), available from the Fuel Cell and Electrolysis text command menu: /define/mod- els/resolved-MEA-fc/advanced-setup/stack-management/. 391 Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Using the Fuel Cell and Electrolysis Text User Interface For fuel cells, you either prescribe the voltage and obtain the total current delivered by the fuel cell as a result, or you specify the total current (via flux boundary conditions multiplied by the area) and obtain the voltage as part of the solution."
5
I heard that The details of this IV-relation are specific for each single fuel cell and depend on mass and heat transport, electrochemistry and inlet conditions, outlet conditions, operating conditions, and any other parameter or material property involved in the calculation. And I was wondering What is the specific thing that the IV-relation is specific for?
fuel cell
Given the context: How would an engineer use the IV-curve?
to see how much power is being delivered
Read the following context and answer the question. Context: As described earlier in this manual, you would start a new simulation from fairly static conditions, that is, high voltage/low current (which implies low species transport and low heat generation). Question: What is a simulation? Answer:
not enough information
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "After con- vergence, you typically may be interested in solutions for new electric boundary conditions, that is, either for a new cell/stack voltage or current."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "In such cases, simply going to the Boundary Conditions task page and changing the value of the electric potential (uds-0) boundary condition, typically allows only small changes, most notably for stacks."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Otherwise the solution will not converge."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "This is where the set-stack-voltage and set- stack-current-density commands are important."
5
In addition to changing the boundary conditions (either to a prescribed voltage or current density), these commands process the current data in order to estimate the solution for the new boundary conditions. Given the context: How would you describe the commands?
they are able to change the boundary conditions
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Because these commands modify the data, you are prompted to save your data, if you have not already done so."
5
Before going into details of the commands, here are some general remarks about electric potential boundary conditions. Given the context: What is the narrator describing?
Electrical components
I heard that For fixed voltage boundary conditions, both external contacts have a fixed value for the electric potential (uds-0). And I was wondering What is the electric potential for the external contacts?
fixed
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The anode value will typically be zero, but it does not have to be."
5
Given the background: The cathode value will be larger than the anode value and the difference ( - ) is the positive cell/stack voltage. and the context: John was trying to figure out how the cathode value and anode value work. He knew that the cathode value would be larger than the anode value. Answer the following question: How would John feel after figuring this out?
smart
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For a fixed current boundary condition, one external contact has to have a fixed value and the other flux boundary conditions."
5
I heard that As described earlier in the manual, typically, the anode will have a fixed (zero) value, and the cathode will be floating, however, you can also set the cathode to a fixed zero potential, yielding a floating negative anode potential. And I was wondering What is the anode in this case?
a fixed (zero) value
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The set-stack-voltage command sets the effective stack voltage, that is, the difference ( - )."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For fixed voltage boundary conditions for the previous solution, boundary conditions on both boundaries are of type fixed value and then the cathode value will be changed accordingly."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "In the case of fixed current boundary conditions for the previous solution, the flux boundary condition will be changed to a fixed value boundary condition, and the value adjusted accordingly with respect to the other fixed value boundary condition."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The set-stack-current-density command sets the current density on one boundary to the desired value."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Note that the input will be in , not as you would normally have to enter in the Boundary Conditions task page."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The reason for this is that average current densities reported in the text command interface are also in , and this makes it easier to choose the conditions you would like to prescribe next."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Also, flux boundary conditions entered in the Boundary Conditions dialog box would have to have a positive sign on the anode side, and a negative sign on the cathode side."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "The input for the text interface command is just a positive number, signs are automatically accounted for."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For fixed current boundary conditions for the previous solution, the set-stack-current-density command changes the respective flux boundary condition accordingly."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "In the case of fixed voltage boundary conditions for the previous solution, the cathode side is chosen to be changed from a fixed value to a flux boundary condition with the new flux."
4
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "392 Fuel Cell Text Commands The two commands may be mixed in an IV-curve calculation."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "For the type of boundary condition setups currently described in this manual, boundary condition changes will consistently happen on the cathode side."
4
I heard that However, if anode flux boundary conditions had been chosen initially, switching to fixed voltage boundary conditions by set-stack-voltage command and then back to fixed current boundary conditions by the set-stack-current-density command will then have flux boundary conditions on the cathode side. And I was wondering What will happen if anode flux boundary conditions had been chosen initially?
anode flux boundary conditions will be chosen
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "In this case, using the set-stack-current-density command exclusively will preserve the anode flux boundary condition setting. 18.3."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Using the Solid Oxide Fuel Cell With Unresolved Electrolyte Text User Interface All of the features for the Solid Oxide Fuel Cell With Unresolved Electrolyte Model that are available through the graphical user interface are also available through text user interface commands."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Once the fuel cell module is loaded (see Loading the Solid Oxide Fuel Cell With Unresolved Electrolyte Module), you can access the text user interface through the Console Window under sofc-model."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "A listing of the various text commands is as follows: sofc-model/ SOFC model menu enable-sofc-model? Enable/disable SOFC model model-parameters Set model parameters electrochemistry Set electrochemistry parameters anode-interface Set fuel cell anode interface cathode-interface Set fuel cell cathode interface tortuosity-interface Set fuel cell tortuosity interface electric-field-model/ Electric field model voltage-tap Set voltage tap surface current-tap Set current tap surface conductive-regions Set conductive regions contact-resistance-regions Set contact resistance regions 393 Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "Using the Solid Oxide Fuel Cell With Unresolved Electrolyte Text User Interface Release 2019 R3 - © ANSYS, Inc."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "All rights reserved."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "- Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "394 Chapter 19: Magnetohydrodynamics Text Commands These are the MHD module text commands available under define/models/: b0-scale-factor Set and apply external magnetic field scale factor."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "boundary-conditions/ Define MHD boundary conditions list-zones List ANSYS Fluent zone information."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "fluid Set fluid zone boundary condition."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "solid Set solid zone boundary condition."
5
On a scale of 1-5 (with 1 being least favorable and 5 being most favorable), how would you rate this review? "wall Set wall boundary condition."
1