The engineering task
A large or unusual nozzle is loaded by internal pressure, piping forces and moments. Nearby openings, reinforcement pads, thickness transitions or adjacent attachments lie outside the reliable scope of simple formulae. A traceable stress assessment using a three-dimensional finite-element model is required.
An FEA result is meaningful only when loads, boundary conditions, mesh, stress classification and allowable limits follow the selected code. Singularities at sharp edges must not be treated as physical structural stress; membrane, bending and peak components require separation according to the assessment route.
Required design data
- Final nozzle, shell and weld geometry
- Pressure, temperature and piping load cases with coordinates
- Material properties and allowable stresses
- Code, stress categories and acceptance criteria
Technical solution approach
Perform analytical screening
Estimate opening reinforcement and local loads where possible to establish FEA plausibility targets.
Define model boundaries
Adequate shell extent, realistic symmetry, supports and load application prevent artificial boundary stress.
Build the FELV model
Transfer geometry, contacts, materials, load combinations and locally refined mesh reproducibly to COMSOL.
Check convergence and stresses
Review mesh convergence, deformation and linearised stress along defined classification lines.
Complete checks and variants
Assess plastic collapse, local failure and any fatigue criteria, then compare design variants.
Expected deliverables
Suitable SOL ALPHA modules
The modules form a technically plausible toolchain. Their final selection and sequence will be confirmed during the later calculation against the applicable code and project conditions.