what's new FLOW-3D version 9.4.1
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Solver
1. Implicit adiabatic bubble model. Improve accuracy of the bubble volume change
calculation to better capture minute compression/expansion.
2. Runtime solver options:
a. Enable the activation of the implicit advection option when a Lagrangian VOF
method is used.
b. Enable the activation of the automatic limited compressibility option.
3. Viewing baffles in GUI. Correction in the pre-processor to enable viewing baffles in the
GUI. Sometimes the STL files created by the pre-processor would not be properly closed
preventing the GUI from opening it.
4. Restart simulations:
a. Correction for the initialization of mass/momentum sources. The definition of
mass/momentum sources in the input file could be lost during restart.
b. Correction for the initialization of voids for heat transfer, e.g., for cooling
channels. The definition of heat transfer voids in the input file could be lost
during restart.
5. Core gas model:
a. Correction in the restart logic for a problem where some cells in the core
component were not initialized correctly, resulting in a crash of the solver.
b. Correction for core component surface cells that have zero surface area to allow
binder decomposition in them.
6. Sediment scour model:
a. Correction in the calculation of the fluid depth and free surface elevation.
Previously, the packed bed was included in these calculations, which was not
intended.
b. Improve the accuracy and stability of the solution at inter-block boundaries.
c. Improve mass conservation of the sediment transport model.
7. Licensing. Correction in the logic for checking out academic license, where the solver
would crash.
8. Implicit heat transfer solver. Correction in the treatment of periodic mesh boundaries,
eliminating a possible convergence problem in the ADI solver.
9. Void temperatures. Correction for the integration of void temperature in the single
precision version to eliminate a round-off error that could result in a negative void
temperature. 10. Two-fluid phase change model. Improve accuracy of the calculations for limiting cases of
cells almost full of liquid, eliminating spurious values of gas density and temperature in
such cells.
11. Turbulence model with dynamic maximum length scale calculation.
a. Correction to prevent un-physically large turbulent viscosities that would reduce
the time step size to very small values.
b. Improve stability of the two-equation turbulence models in compressible flows.
12. Split Lagrangian VOF advection.
a. Correction in the second-order advection of macroscopic fluid energy,
eliminating possible fluctuations of temperature.
b. Improve stability of the advection of the liquid/gas mixture. This correction
reduces, but does not completely eliminate, small fluctuations in the mixture
density.
13. GMO Model:
a. Correction in the integration of pressure over the surface of GMO components
by excluding the surfaces adjacent to mesh boundaries where pressures are not
known.
b. Correction in the integration of the viscous friction force when the LES
turbulence model is used, in which case the force could be unreasonably large.
c. Correction for the calculation of the force moments for fixed-axis GMO
components. The moments could incorrectly end up equal to zero.
14. Force calculations on walls. Improved the accuracy of the pressure and fluid velocity
calculations near walls, which in turn reduced the noise in the pressure forces on solid
components.
15. Elastic stress model. Correction in the evaluation of the yield stress at free surface,
where the model was using a zero yield stress, instead of the user-defined value.
16. Two-phase drift-flux model. Correction for the scalar fluxes at inter-block boundaries.
Previously, the concentration of scalars could change significantly when fluid crossed an
inter-block boundary.
17. Volume error recycling. Extend the one-fluid volume error recycling to the two-fluid
model. This can potentially significantly improve the conservation of fluid volume.
18. Porous media flow. Change the default for the specific surface area from 0.0 to 1.0. This
ensures that heat transfer and mass source models will work inside the porous media
without the need to define this quantity.
19. One-fluid mass source model. Correction for the setting of the source fluid density when
gas (i.e., void) is generated at the source in one-fluid problems. Previously, the user
input for the gas density at mass sources was replaced with the default density of fluid
#2, making it difficult to define the source flow rate for the gas. 20. Interface pinning. An addition to allow for the pinning of the fluid interface at solid walls
in simple fluid configurations, using a foam-type phantom component. The component
is defined with IFOB(n)=1 and HOBS1(n)=0.0. Any fluid interface adjacent to this
component, with a wetting contact angle, will not move, i.e., will be “pinned”.
21. Non-inertial reference frame motion. Correction for the setting of the initial gravity
vector. Previously, the user input for the gravity vector could be overwritten during
solver initialization.
22. Implicit advection. Improve the accuracy of the implicit advection of fluid density and
energy in one-fluid flows.
GUI/Post-processor
1. Certain instability problems leading to GUI crashes were resolved
2. The rendering times for 3D results have been reduced
3. The time required to generate 3D animations has been reduced
4. The FLOWVU STL viewer has been included in the LINUX distribution
5. The following problems have been addressed and corrected:
a. In the 3D Analyze tab:
i. When Data source was set to Solidification, color variable selections
disappeared after Render or Reload.
ii. The left slider jumped 1 position after render
b. In the Analyze tab, sliders moved randomly when switching from one tab to
another.
c. In the Runtime Changes to the Solver dialog:
i. Changes to implicit convergence controls for "Heat transfer" and "Elastic
stress" were not being passed back to the solver.
ii. Users could not set "IMP=2"
d. In Selected Data output, “Excess shear stress" and "Phase Change Mass Flux"
were not available.
e. Graphic text color was randomly being reset back to default (white)
f. Baffle color changed from BLUE to GRAY when Baffle Options was selected
g. Incorrect unit conversion occurred when material was loaded a 2nd time from
fluids database.
h. "User defined" contour limits disappeared after a "Reload".
i. Problems with lighting in Meshing & Geometry when a component was added to
a new simulation
j. In 3D Display, the title was not being cleared when a new results file was opened
k. In Streamline Edit:
i. Endpoints are no longer rendered ii. Seed points can no longer be specified that are not on the seed plane
iii. Seed locations specified on the Z plane were not correctly saved to a file
l. With combination fluid and wall temperature plots, there were plotting
problems when generating plots across a spatial domain
m. Once turned on, parameter "iresf1" (restart options) could not be turned off
n. In the Fluids tab, Edit boxes for "Elastic modulus" and "Yield stress" were inactive
until heat transfer was activated
o. In the Fluids database editor, incorrect labels appeared in the dialog used to edit
"temperature" vs "thermal conductivity"
p. In 2D contour plots, fluid surface contour was being omitted for some variables
q. The "append" function did not work for 3D iso-surface plots when existing
frames resided in a directory other than the current directory.
r. ASCII STL file names could not contain spaces.
s. Variable PQSRSS was not recognized.
t. Nested cylindrical mesh blocks were not always visualized correctly in 2D overlay
(32-bit windows)
u. On Windows operating systems, 3D renders did not work where the file path for
results files contained special characters and no spaces
v. On Linux operating systems, 3D renders did not work where the file path for
results files contained spaces
w. Nested cylindrical mesh blocks with inter-block boundary were not visualized
correctly in 3D Display
x. Reloading results while the post-processor was being run at the end of a
simulation crashed the GUI
y. "Auto" and "User defined" color scales not working when using "Render frames
to disk" option.
z. Scalars defined at boundaries were not loaded into the GUI in multi-block
simulations when there were no scalars defined on any block 1 boundary.
