Using Bloc from DWSIM

DWSIM can call Bloc directly from its embedded IronPython scripting environment (Simulation → Object Editor → Scripts), letting a DWSIM flowsheet stream compositions/conditions into a Bloc reactor model and read the results back into a DWSIM material stream.

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Environment

DWSIM users should build the environment from environment-dwsim.yml, not the main environment.yml — it excludes the private packages (spy, schem) that aren’t needed to run Bloc reactor models standalone:

conda env update --file environment-dwsim.yml --name bloc
conda activate bloc

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bloc.io.dwsim compatibility shim

DWSIM’s IronPython (Python.NET) environment does not handle Python’s print the same way CPython does, and mixed bytes/string output from Cantera/NumPy objects can raise or produce garbled output. Import bloc.io.dwsim at the very top of a DWSIM script to patch builtins.print with a DWSIM-safe version before doing anything else:

import bloc.io.dwsim  # fixes Python.NET print/output issues

from bloc.testing.testing_utils import defaults, default_simulation

config = defaults()
sim = default_simulation(**config)

Set the DWSIM_SILENT environment variable to "true" before the import to suppress all print output instead of sanitizing it (useful once a script is verified and running unattended inside a flowsheet).

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Example script

sandbox/dwsim_script/dwsim_bloc_script.py is a worked example: it reads temperature, pressure and composition off a DWSIM input material stream (ims1), maps them onto a Bloc STONE scenario via ctwrap, runs the simulation, and writes the reactor outlet state back onto a DWSIM output stream (oms1). ims1/oms1 are provided by DWSIM’s script runner itself — they are not Bloc objects and do not need to be imported.