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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 |