Chem bulk relax #12
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Chem bulk relax #12
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… the thermal shear tensor
We first read in the participant list and determine the event center. We shift the event center to origin. This is useful for asymmetric collisions such as p+Au collisions. Then we find the maximum (x, y) coordinate for the participant nucleon in the event. Finally, the grid size is determined by 2*(x_max + gridOffset) and 2*(y_max + gridOffset) Here the gridOffset = min(3, 5*nucleonWidth). We impose a minimum gridOffset = 3 fm so that when nucleonWidth < 0.6 fm, we still have a large enough grid for the simulations. We tested central Au+Au collision would have a grid size of [-12, 12] fm. and p+Au collision would have a grid size of [-7, 7] In this case, the grid spacing in small collision system will be higher for better accuracy.
Do not use the ${CMAKE_SOURCE_DIR} for the version.h.in file to avoid
confliction when compile MUSIC as an external code package in JETSCAPE
because the variable ${CMAKE_SOURCE_DIR} will be set by the JETSCAPE
directory, not locally from the MUSIC directory.
Simplely omitting it would make the compile work for both JETSCAPE and
MUSIC alone.
Because we improved the stabilitiy of the eos_hotQCD class in the previous commit, the IPGlasma2D test failed because the results is no longer identical to the previous one. We checked that they are still within negligible difference. Now, we update the numbers in the IPGlasma2D test for the latest version of the code.
We use reRunCount to record the times of reRunHydro. When reRunHydro is triggered, we will enlarge the transverse grid by 2 fm in x and y directions. The reRunHydro flag remains effective when the reRunCount < 10.
density The bug was introduced on Aug. 31, 2024 (commit #: d597e4d) when I reformatting the read_in_parameters functions. "eps_switch" needs to be the last one to modify the epsilon_freeze variable so that it is the default parameter. From Aug. 31, 2024 until now, the epsilon_freeze was set to the value of eps_freeze_max (0.18 GeV/fm^3) and user's input of eps_swtich is not effective. Thanks to Xiangyu Wu who pointed out this bug to me!
When the system is too far away from equilibirum, namely 1.5*(RShear + Rbulk) > 1, we will reduce the magnetudes of pi and bulkPi by a factor so that 1.5*(RShear + Rbulk) < 1 - 1e-6.
…tions Adopt codes from Wille_dev branch for checking necessary causal conditions and reduce the viscous stress tensor when the causal conditions are violated.
to be consistent with the resummed scheme and causality conditions
For IP-Glasma initial condition, we impose regulation on the viscous stress tensor (both shear and bulk) at the initial condition level before any evolution when FlagResumTransportCoeff is turned on.
For jet quenching calculations, ideal part of the medium evolution is sufficient. It can save disk space.
with the transverse grid is too small, add 10 more grid points on each side to enlarge the grid size every time
make alpha_preFlow dimensionless
- Add pi_b_chem member to Cell_small class with proper operator overloads - Add bulkPi_chem field to fluidCell struct in data_struct.h - Add piBulkChem_ vector field to Fields class - Update Fields methods to handle chemical bulk viscosity - Initialize piBulkChem_ field in resizeFields and destructor
Add FlagBulkChem in data.h; to make sure Cell::pi_b_chem and Fields::piBulkChem_ are used clear
…p this runs with idx_1d==14
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The calculation of bulk pressure, viscosity and relaxation time of Chemical Equilibration project