CFD Solver Developer

Neemus Software; Hyderabad; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Neemus Software in Hyderabad invites an experienced CFD software engineer to design and implement a high-performance finite-volume solver on unstructured meshes. You will handle pressure-velocity coupling (SIMPLE/SIMPLEC/PISO), turbulence models, and conjugate heat transfer with radiation.

The role requires parallel programming with MPI/OpenMP, integration of PETSc/hypre, and support for large-scale simulations. Collaboration with GUI and validation teams is essential for defense-grade projects.

Qualifications

• Strong modern C++ (C++14/17/20) with OOP, STL
• Hands-on CFD solver coding with FVM on unstructured meshes
• Navier-Stokes and heat transfer knowledge
• Iterative linear solvers, preconditioners, convergence and time integration
• MPI/OpenMP parallel programming
• Linux/Windows, CMake, Git, debugging and profiling tools

Responsibilities

• Design and implement a finite-volume CFD solver in modern C++ (C++17/20) on unstructured meshes.
• Implement pressure-velocity coupling (SIMPLE / SIMPLEC / PISO) for steady and transient flows.
• Implement turbulence models: k-, k- SST, Spalart-Allmaras with wall functions.
• Conjugate heat transfer with convection and radiation coupling.
• Develop exhaust plume and species transport models under wind conditions.
• Parallelise with MPI and OpenMP; integrate PETSc or hypre; optimise for large meshes.
• Write readers for CGNS and ANSYS Fluent mesh/case/data files; export to HDF5.
• Run verification/validation against Fluent/STAR-CCM+ and benchmarks; mesh-independence studies.
• Write unit and regression tests and DRDO DSSD-compliant documentation.
• Collaborate with Qt GUI team on solver APIs and NSTL reviews.

Skills

C++17/20

CFD solver

MPI/OpenMP

Unstructured meshes

Navier–Stokes

Heat transfer

Education

B.Tech/M.Tech / M.E./ PhD in Mechanical

Tools

PETSc

hypre

HDF5

CGNS

OpenFOAM

Job description

Role & responsibilities

1. Design and implement a finite-volume (FVM) CFD solver in modern C++ (C++17/20) on unstructured meshes.

2. Implement pressure-velocity coupling (SIMPLE / SIMPLEC / PISO) for steady and transient, incompressible and compressible flows.

3. Implement turbulence models: k-, k- SST, Spalart-Allmaras, with wall functions.

4. Implement conjugate heat transfer (fluid + solid conduction), convection, and coupling with radiation (P1 / DOM source terms).

5. Develop exhaust plume and species transport models: plume rise, dispersion, temperature decay and mixing under different wind conditions.

6. Implement boundary conditions for ship operating conditions: 030 knots, 25/50/100% engine load, wind, solar heating and sea-state inputs.

7. Parallelise the solver with MPI and OpenMP; integrate PETSc or hypre linear solvers; optimise for multi-million-cell meshes on workstations and HPC clusters.

8. Write readers for CGNS and ANSYS Fluent mesh/case/data files (.msh, .cas, .dat), and export results to the IR module (HDF5).

9. Run verification and validation against ANSYS Fluent / STAR-CCM+ and analytical benchmarks, including mesh-independence studies, to meet 5% acceptance limits.

10. Write unit and regression tests, and the theory and algorithm documentation required by DRDO DSSD standards: equations, discretisation, and variable-to-code mapping.

11. Work with the GUI (Qt/C++) team on solver APIs, and support NSTL technical reviews and training sessions.

Manda

Preferred candidate profile

Education:

B. TECH/M.Tech / M.E. / PhD in Mechanical, Aerospace, Chemical or Applied Mechanics, with a specialisation in CFD, thermal sciences or computational mechanics.

Must have:

• Strong modern C++ (C++14/17/20): OOP, templates, STL, memory management, performance tuning.
• Hands-on experience writing CFD solver code (not only using commercial tools): FVM discretisation, gradient and flux schemes, unstructured mesh data structures.
• Sound knowledge of fluid mechanics and heat transfer: Navier-Stokes, energy equation, RANS turbulence modelling, conduction-convection-radiation.
• Numerical methods: iterative linear solvers, preconditioners, convergence and stability, time integration.
• Parallel programming with MPI and/or OpenMP.
• Linux and Windows development with CMake, Git, debugging and profiling tools.
• Working use of ANSYS Fluent, STAR-CCM+ or OpenFOAM for validation and comparison.

Preferred

• Contributions to open-source CFD codes (SU2, OpenFOAM, Code_Saturne) or in-house solvers at DRDO, ISRO, HAL, NAL or IIT labs.
• Conjugate heat transfer, combustion or exhaust plume modelling; radiation models (P1, DOM).
• PETSc, hypre, Eigen, HDF5, CGNS.
• Naval, aerospace or defence thermal applications; IR signature or ship-thermal work.

Experience with GoogleTest, CI pipelines and technical documentation for defence or regulated projects