Centralize the equation-of-state expressions in the Riemann solvers

.claude/rules/common-pitfalls.md

@@ -36,6 +36,35 @@ covered in `docs/documentation/contributing.md`.
 - `@:ACC_SETUP_VFs(...)`/`@:ACC_SETUP_SFs(...)` GPU pointer setup compiles only under
   Cray. Around MPI: `GPU_UPDATE(host=...)` before send, `GPU_UPDATE(device=...)` after
   receive.
+- An array whose bound is a device global (`dimension(num_fluids)`, `dimension(num_species)`) may be
+  passed to a device routine **from a parallel-loop body, but not from inside another
+  `GPU_ROUTINE(parallelism='[seq]')`**. CCE OpenACC rejects the second form with
+  `ftn-7066 ... Global in accelerator routine without declare -- num_fluids`, and reports it at
+  whatever line it gave up on: remove one trigger and the message *walks forward* to the next call,
+  so the reported line is not the cause. Only the plain lanes fail - under `--case-optimization`
+  those bounds are `parameter`s, so a green Case Opt lane beside a failing plain one is the
+  signature. Every accepted call site in the tree already obeys this (`m_cbc`, `m_ibm`,
+  `m_bubbles_EL`, `s_compute_cell_state`): form such a call in the loop body and pass scalars
+  deeper. Neither `cray_inline` nor a `num_fluids_max` bound nor dropping optional dummies helps -
+  all three were measured.
+- nvfortran 23.11/24.1 segfault (`fort2 TERMINATED by signal 11`) on a caller that passes a
+  `parameter` array from `m_thermochem` (e.g. `molecular_weights`) into a declare-target routine.
+  Read such arrays directly in the kernel, or pass a plain local computed from them.
+- The `USING_AMD` fypp guards (86 sites, `#:set` in `src/common/include/shared_parallel_macros.fpp`) are
+  load-bearing, not a stale workaround - do not "modernize" them away. They swap a device-global array
+  bound for a literal: `dimension(3)` for `num_dims`/`num_fluids` when case optimization is off (64
+  sites), and `dimension(20)` for `sys_size` in `m_compute_cbc` (21 sites, with a matching
+  `@:PROHIBIT` in `m_start_up` capping `sys_size <= 20` under AMD+CBC). Setting `USING_AMD = False`
+  and rebuilding amdflang `--gpu mp` without case optimization compiles CLEAN - 728 s, zero
+  diagnostics - and then NaNs at step 50 in CBC, riemann `wave_speeds=2`, IBM, surface tension,
+  QBMM/viscous and MHD HLLD, while both Lagrange bubble cases *complete* with out-of-tolerance
+  answers. Measured 2026-08-29 on MI210. A compile-only check returns green, so any future attempt to
+  drop these must run the tests, not just build.
+- The same "call it from the loop body" rule covers `m_thermochem`: calling `get_species_*` from
+  inside a `GPU_ROUTINE` rather than from the kernel gave CCE OpenMP a runtime
+  `Memory access fault by GPU node-N ... Reason: Unknown` on the first step (exit 134), while every
+  other backend ran. Evaluate them at the call site and pass the arrays in. Note this one only shows
+  at runtime, and only on a case that reaches the path - the build is clean.
 
 ## Parameters
 
@@ -105,6 +134,27 @@ covered in `docs/documentation/contributing.md`.
 - Tests are generated programmatically in `toolchain/mfc/test/cases.py` (parameter
   modifications on `BASE_CFG` via the `CaseGeneratorStack` push/pop pattern); test UUID =
   CRC32 of the trace string; `./mfc.sh test -l` lists all.
+- `--only` matches whole trace *elements*, not substrings, and `_filter_only`
+  (`toolchain/mfc/test/test.py`) **ANDs labels while ORing UUIDs**. So `--only bubbles` matches
+  nothing (the element is `Bubbles`), and `--only low_Mach=1 low_Mach=2` asks for cases carrying
+  both and also matches nothing. It then exits **143**, which reads like an external kill rather
+  than an empty filter. Pass UUIDs whenever you want the union of several groups.
+- Sibling `define_case_d` calls off the same stack level are never *combined*. Two switches that
+  only matter together (`avg_state=1` needs `wave_speeds=2` to be read at all) therefore get zero
+  effective coverage unless something pushes one and defines the other beneath it. Check
+  reachability before trusting that a flag is tested.
+- `--no-build` silently runs whatever binary is on disk for a configuration it did not build.
+  Chemistry has its own config (`gpu-mp-chem-*`) that a plain `./mfc.sh build` never produces, so
+  a `--no-build` run reports failures from stale binaries and hides real compile breaks. Run
+  chemistry-touching sets without it.
+- Pick the newest binary by the *binary's* mtime (`ls -t build/install/*/bin/simulation`), not the
+  install directory's - a stale config's directory can be newer than a fresh build's.
+- The pre-commit hook lives in the main repo's `.git/hooks/` and git exports `GIT_DIR` there
+  during a commit, so from a worktree the toolchain lint enumerates the *other* checkout and
+  fails. Reproduce with `GIT_DIR=<main>/.git ./mfc.sh precheck`. Run precheck by hand and commit
+  with `--no-verify`.
+- `/tmp` is node-local: scratch does not survive a compute-node change, and its absence is
+  silence, not an error. Keep patches and resource baselines on a shared filesystem.
 - Golden files are tolerance-compared. Regenerate only the affected tests
   (`./mfc.sh test --generate --only <tests>`) — an unexplained golden-file diff is a bug
   report, not noise to be regenerated away.

docs/documentation/contributing.md

@@ -452,6 +452,31 @@ $:GPU_DECLARE(create='[my_array]')
 
 If an array is allocated inside an `if` block, its deallocation must follow the same condition.
 
+### How to Add an Equation of State
+
+Every stiffened-gas expression lives in `src/common/m_variables_conversion.fpp`. Adding a second EOS
+means supplying these, not grepping for `gammas`:
+
+| Operator | Gives |
+|---|---|
+| `s_compute_mixture_coefficients` / `_dt` | mixture \f$\Gamma, \Pi_\infty, q_v\f$ from the phase fractions, and their time derivative |
+| `f_pressure` / `s_compute_energy` | \f$p(e)\f$ and \f$E(p)\f$ |
+| `f_bulk_modulus` | \f$K(p)\f$ - every sound speed in MFC is \f$K/\rho\f$, differing only in how phases are mixed |
+| `s_compute_speed_of_sound` / `_avg` | that mixing: Wood's law, 6-equation, bubble-diluted |
+| `f_phase_internal_energy` | per-phase internal energy (6-equation model) |
+| `f_isentrope_exponent` / `f_isentrope_pressure` / `f_pressure_on_isentrope` | the isentrope \f$p + B = \textrm{const}\,\rho^n\f$ |
+| `f_sg_thermal` | the thermal law \f$p + B = (n-1)c_v\rho T\f$ |
+
+The first six are *mechanical* - they need only \f$p, \rho, e, c\f$. The last two are *caloric* and
+additionally need \f$c_v\f$ and \f$q'_v\f$. An EOS that supplies only the mechanical set cannot support
+phase change (`m_phase_change` also needs entropy and enthalpy) or reactive burn, so those features
+must be prohibited for it in `case_validator.py`.
+
+The coefficients arrive in two parameterizations of the same EOS: `gammas`/`pi_infs` are the stored
+forms the user supplies (see @ref sec-stored-forms), and `isentrope_n`/`isentrope_B` are the same EOS
+as \f$p + B = \textrm{const}\,\rho^n\f$, derived once at start-up. Convert with the `f_isentrope_*`
+operators rather than open-coding either relation.
+
 ### How to Add a Test Case
 
 **Step 1: Create a case file**

docs/documentation/equations.md

@@ -644,7 +644,7 @@ Reaction mechanisms are code-generated via Pyrometheus (\cite Cisneros26), which
 
 ## 10. Surface Tension (`surface_tension = .true.`) (\cite Schmidmayer17; \cite Wilfong26 Sec. 4.1.8)
 
-**Source:** `src/simulation/m_surface_tension.fpp`, `src/simulation/include/inline_capillary.fpp`
+**Source:** `src/simulation/m_surface_tension.fpp`
 
 **Color function advection:**
 

docs/documentation/gpuParallelization.md

@@ -614,15 +614,14 @@ Does not do anything for OpenMP currently
 pure, sequential per-thread helpers is:
 
 ```fortran
-subroutine s_accumulate_mixture_properties(nf, alpha_rho_K, alpha_K, rho_K, gamma_K, pi_inf_K, qv_K)
+subroutine s_compute_mixture_coefficients(alpha_rho_K, alpha_K, rho_K, gamma_K, pi_inf_K, qv_K)
 
-    $:GPU_ROUTINE(function_name='s_accumulate_mixture_properties', parallelism='[seq]', cray_inline=True)
+    $:GPU_ROUTINE(function_name='s_compute_mixture_coefficients', parallelism='[seq]', cray_inline=True)
 
-    integer, intent(in)                 :: nf
-    real(wp), dimension(nf), intent(in) :: alpha_rho_K, alpha_K
-    real(wp), intent(out)               :: rho_K, gamma_K, pi_inf_K, qv_K
+    real(wp), dimension(num_fluids), intent(in) :: alpha_rho_K, alpha_K
+    real(wp), intent(out)                       :: rho_K, gamma_K, pi_inf_K, qv_K
     ...
-end subroutine s_accumulate_mixture_properties
+end subroutine s_compute_mixture_coefficients
 ```
 
 **When to use it.** Extract a block into a `GPU_ROUTINE` helper when:

examples/0D_bubblecollapse_adap/case.py

@@ -122,6 +122,7 @@
             "nb": nb,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (gam_l - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gam_l * (pi_inf_l / p0) / (gam_l - 1.0),
         }
     )

examples/1D_acoustic_dipole/case.py

@@ -64,6 +64,7 @@
             "acoustic(1)%delay": 1e-7,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 5.57e08 / (4.4e00 - 1.0e00),
         }
     )

examples/1D_acoustic_gauss_sigmadist/case.py

@@ -63,6 +63,7 @@
             "acoustic(1)%delay": 1e-7,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 5.57e08 / (4.4e00 - 1.0e00),
         }
     )

examples/1D_acoustic_gauss_sigmatime/case.py

@@ -63,6 +63,7 @@
             "acoustic(1)%delay": 1e-7,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 5.57e08 / (4.4e00 - 1.0e00),
         }
     )

examples/1D_acoustic_sine_frequency/case.py

@@ -63,6 +63,7 @@
             "acoustic(1)%delay": 0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 5.57e08 / (4.4e00 - 1.0e00),
         }
     )

examples/1D_acoustic_sine_wavelength/case.py

@@ -63,6 +63,7 @@
             "acoustic(1)%delay": 0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 5.57e08 / (4.4e00 - 1.0e00),
         }
     )

examples/1D_advection_convergence/case.py

@@ -94,8 +94,10 @@
             "patch_icpp(1)%alpha(1)": "0.5 + 0.2 * sin(2.0 * pi * x / lx)",
             "patch_icpp(1)%alpha(2)": "0.5 - 0.2 * sin(2.0 * pi * x / lx)",
             "fluid_pp(1)%gamma": 1.0 / (gamma - 1.0),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
             "fluid_pp(2)%gamma": 1.0 / (gamma - 1.0),
+            "fluid_pp(2)%eos": "ideal_gas",
             "fluid_pp(2)%pi_inf": 0.0,
             **scheme_params,
         }

examples/1D_brio_wu/case.py

@@ -73,6 +73,7 @@
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (2.0e00 - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         }
     )

examples/1D_brio_wu_hlld/case.py

@@ -74,6 +74,7 @@
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (2.0e00 - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         }
     )

examples/1D_brio_wu_rmhd/case.py

@@ -75,6 +75,7 @@
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (2.0e00 - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         }
     )

examples/1D_bubblescreen/case.py

@@ -139,6 +139,7 @@
             "patch_icpp(2)%v0": 0.0e00,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (gam_l - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gam_l * (pi_inf_l / p0) / (gam_l - 1.0),
             # Bubbles
             "bubbles_euler": "T",

examples/1D_cont_damage/case.py

@@ -84,9 +84,11 @@
             "patch_icpp(2)%tau_e(1)": 0.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 6.0e08 / (4.4e00 - 1.0e00),
             "fluid_pp(1)%G": 0e0,
             "fluid_pp(2)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(2)%eos": "stiffened_gas",
             "fluid_pp(2)%pi_inf": 4.4e00 * 6.0e08 / (4.4e00 - 1.0e00),
             "fluid_pp(2)%G": 1.0e09,
         }

examples/1D_convergence/case.py

@@ -73,8 +73,10 @@
             "patch_icpp(1)%alpha(2)": "0.5 + 0.5*sin(2*pi*x)",
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (1.4 - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
             "fluid_pp(2)%gamma": 1.0e00 / (1.4 - 1.0e00),
+            "fluid_pp(2)%eos": "ideal_gas",
             "fluid_pp(2)%pi_inf": 0.0,
         }
     )

examples/1D_dai_woodward/case.py

@@ -82,6 +82,7 @@
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / ((5.0 / 3.0) - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         },
     )

examples/1D_dai_woodward_hlld/case.py

@@ -83,6 +83,7 @@
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / ((5.0 / 3.0) - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         },
     )

examples/1D_euler_convergence/case.py

@@ -99,6 +99,7 @@
             "patch_icpp(1)%alpha_rho(1)": "1.0 + 0.2 * sin(2.0 * pi * x / lx)",
             "patch_icpp(1)%alpha(1)": 1.0,
             "fluid_pp(1)%gamma": 1.0 / (gamma - 1.0),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
             **scheme_params,
         }

examples/1D_exp_bubscreen/case.py

@@ -141,6 +141,7 @@
             "patch_icpp(2)%v0": 0.0e00,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (gam_l - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gam_l * (pi_inf_l / p0) / (gam_l - 1.0),
             # Bubbles
             "bubbles_euler": "T",

examples/1D_exp_tube_phasechange/case.py

@@ -180,16 +180,19 @@
             "patch_icpp(2)%alpha(3)": aa1,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (gamwl - 1),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gamwl * piwl / (gamwl - 1),
             "fluid_pp(1)%cv": cvwl,
             "fluid_pp(1)%qv": qvwl,
             "fluid_pp(1)%qvp": qvpwl,
             "fluid_pp(2)%gamma": 1.0e00 / (gamwv - 1),
+            "fluid_pp(2)%eos": "stiffened_gas",
             "fluid_pp(2)%pi_inf": gamwv * piwv / (gamwv - 1),
             "fluid_pp(2)%cv": cvwv,
             "fluid_pp(2)%qv": qvwv,
             "fluid_pp(2)%qvp": qvpwv,
             "fluid_pp(3)%gamma": 1.0e00 / (gama - 1),
+            "fluid_pp(3)%eos": "stiffened_gas",
             "fluid_pp(3)%pi_inf": gama * pia / (gama - 1),
             "fluid_pp(3)%cv": cva,
             "fluid_pp(3)%qv": qva,

examples/1D_flamelet/case.py

@@ -66,6 +66,7 @@
     "patch_icpp(1)%alpha(1)": 1,
     "patch_icpp(1)%alpha_rho(1)": "1",
     "fluid_pp(1)%gamma": 1.0e00 / (1.5e00 - 1.0e00),
+    "fluid_pp(1)%eos": "stiffened_gas",
     "fluid_pp(1)%pi_inf": 0,
     "cantera_file": ctfile,
 }

examples/1D_hypo_2materials/case.py

@@ -78,9 +78,11 @@
             "patch_icpp(2)%tau_e(1)": 0.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 6.0e08 / (4.4e00 - 1.0e00),
             "fluid_pp(1)%G": 1.0e09,
             "fluid_pp(2)%gamma": 1.0e00 / (1.4e00 - 1.0e00),
+            "fluid_pp(2)%eos": "ideal_gas",
             "fluid_pp(2)%pi_inf": 0.0,
             "fluid_pp(2)%G": 0.0,
         }

examples/1D_impact/case.py

@@ -74,6 +74,7 @@
             "patch_icpp(2)%tau_e(1)": 0.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 6.0e08 / (4.4e00 - 1.0e00),
             "fluid_pp(1)%G": 0.5e09,
         }

examples/1D_inert_shocktube/case.py

@@ -98,6 +98,7 @@
     "patch_icpp(2)%alpha_rho(1)": sol_R.density,
     # Fluids Physical Parameters
     "fluid_pp(1)%gamma": 1.0e00 / (1.55e00 - 1.0e00),
+    "fluid_pp(1)%eos": "stiffened_gas",
     "fluid_pp(1)%pi_inf": 0,
     # Chemistry
     "cantera_file": ctfile,

examples/1D_kapilashocktube/case.py

@@ -65,8 +65,10 @@
             "patch_icpp(2)%alpha(2)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (4.4e00 - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": 4.4e00 * 6.0e08 / (4.4e00 - 1.0e00),
             "fluid_pp(2)%gamma": 1.0e00 / (1.4e00 - 1.0e00),
+            "fluid_pp(2)%eos": "ideal_gas",
             "fluid_pp(2)%pi_inf": 0.0e00,
         }
     )

examples/1D_laxshocktube/case.py

@@ -65,6 +65,8 @@
             "patch_icpp(2)%alpha_rho(1)": 0.5e00,
             "patch_icpp(2)%alpha(1)": 1.0,
             # Fluids Physical Parameters
+            # air: an ideal gas, so it carries no stiffness and pi_inf is not read
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%gamma": 1.0e00 / (1.4 - 1.0e00),
             "fluid_pp(1)%pi_inf": 0.0,
         }

examples/1D_mhd_smooth_alfven_wave/case.py

@@ -61,6 +61,7 @@
             "patch_icpp(1)%alpha(1)": 1.0,
             # Fluids Physical Parameters
             "fluid_pp(1)%gamma": 1.0e00 / (5.0 / 3.0 - 1.0e00),
+            "fluid_pp(1)%eos": "ideal_gas",
             "fluid_pp(1)%pi_inf": 0.0,
         }
     )

examples/1D_multispecies_diffusion/case.py

@@ -68,6 +68,7 @@
     "patch_icpp(1)%alpha(1)": 1,
     "patch_icpp(1)%alpha_rho(1)": 1,
     "fluid_pp(1)%gamma": 1.0e00 / (1.9326e00 - 1.0e00),
+    "fluid_pp(1)%eos": "stiffened_gas",
     "fluid_pp(1)%pi_inf": 0,
     "cantera_file": ctfile,
 }

examples/1D_poly_bubscreen/case.py

@@ -124,6 +124,7 @@
             # Fluids Physical Parameters
             # Surrounding liquid
             "fluid_pp(1)%gamma": 1.0e00 / (gam_l - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gam_l * (pi_inf_l / p0) / (gam_l - 1.0),
             # Bubbles
             "bubbles_euler": "T",

examples/1D_propellant_flame/case.py

@@ -106,6 +106,7 @@
     "patch_icpp(2)%alpha_rho(1)": burned.density,
     # Fluid EOS (ideal-gas closure is bypassed by chemistry, but gamma/Re must be set)
     "fluid_pp(1)%gamma": 1.0 / (1.4 - 1.0),
+    "fluid_pp(1)%eos": "stiffened_gas",
     "fluid_pp(1)%pi_inf": 0.0,
     "fluid_pp(1)%Re(1)": 1.0 / fresh.viscosity,
 }

examples/1D_qbmm/case.py

@@ -138,6 +138,7 @@
             # Fluids Physical Parameters
             # Surrounding liquid
             "fluid_pp(1)%gamma": 1.0e00 / (gam_l - 1.0e00),
+            "fluid_pp(1)%eos": "stiffened_gas",
             "fluid_pp(1)%pi_inf": gam_l * (pi_inf_l / p0) / (gam_l - 1.0),
             # Bubbles
             "bubbles_euler": "T",

examples/1D_reactive_burn/case.py

@@ -113,9 +113,11 @@
     "patch_icpp(2)%alpha(2)": a2,
     # Fluid EOS: reactant (1) and product (2) share gamma/pi_inf, differ only in qv.
     "fluid_pp(1)%gamma": gamma_p,
+    "fluid_pp(1)%eos": "stiffened_gas",
     "fluid_pp(1)%pi_inf": pi_inf_p,
     "fluid_pp(1)%qv": Q,
     "fluid_pp(2)%gamma": gamma_p,
+    "fluid_pp(2)%eos": "stiffened_gas",
     "fluid_pp(2)%pi_inf": pi_inf_p,
     "fluid_pp(2)%qv": 0.0,
 }