Our explicit dynamics analysis (EDA) consultants use ANSYS Autodyn to simulate the response of materials to short duration severe loadings from impact, high pressure or explosions. We simulate complex physical phenomena such as the interaction of liquids, solids and gases; the phase transitions of materials; and the propagation of shock waves. Our EDA consulting services include:

- Aerospace Applications: aircraft impact, space shield design and space debris impact

- Drop Test: consumer products and military standard issue

- Explosives Development: studying the brisance of high explosives

- Infrastructure Protection: threat consequence vulnerability risk assessment, blast effect analysis
- Land Applications: armour, anti-armour, mine protection and vulnerability against IEDs

- Material Science: properties, effectiveness of ballistic glass and reinforced concrete
- Naval Applications: vessel vulnerability and underwater blast

- Personnel Protection: body armour, helmet against blast effect and projectiles


We provide simulation services to clients globally across many industries. Performing modelling & simulation without proper knowledge may lead to misleading results. To ensure the simulation results are accurate, we only assign personnel with a PhD qualification specialised in modelling and simulation. These specialists are supported by conventional engineering to ensure the prescribed solutions are realistic. In addition, we invest in ANSYS simulation software which represent more than 1,000 person-years of R&D and employ only heavily validated models which provide assurance to stakeholders of high accuracy results. We offer 3rd-party independent modelling & our simulation consultants have a combined experience of 50 years in modelling & simulation. Currently, we undertake complex projects globally and offer the following simulation services:

- Computational Fluid Dynamics (CFD specialists)

- Finite Element Analysis (FEA specialists)

- Fluid Structure Interaction (FSI specialists)

- Explicit Dynamics Analysis (EDA specialists)




Our simulation consultants use ANSYS Fluent which is the most-powerful CFD simulation software tool available, empowering our clients to go further and faster as we optimise their product's performance. Fluent includes well-validated physical modelling capabilities to deliver fast, accurate results across the widest range of CFD and multiphysics applications. The projects we undertake are related to aerodynamic, single-phase, multiphase, multispecies, reaction chemistry, sliding mesh, combustion, energy and solidification-melting processes. Our computational fluid dynamics simulation services include but not limited to:

- Building & Environment: wind driven rain, pollutant emission, smoke propagation, thermal comfort

- Chemical & Petrochemical: unit operations, reactors, distillation columns, cyclones, heat exchangers

- Defence & Security: air, naval, land, weapons development, terrorist CBR attack scenarios

- Food & Beverage: equipment design, preparation processes, storage and distribution

- Renewable Energy: geothermal, wind power, hydro power and waste heat extraction

- Ship Building: design of ship hull, assess propulsion system, gas abatement, ballast water

- Water and wastewater: unit operations, pump sump, open channel and pressure surge analysis

Finite Element Analysis (FEA)

Our simulation consultants use ANSYS Mechanical to simulate everything from a bonded contact that treats joints between parts as if they are glued or welded together, to contact interfaces that allow parts to move apart and together with or without frictional effects. Being able to simulate contact correctly means that we can simulate the change in load paths when parts deform and confidently predict how assemblies will behave in the real world. Our simulation results can predict and solve structural problems, optimise designs and reduce costs of physical testing. Our FEA simulation services cover durability, fatigue, stress, strength, buckling, force estimations, vibrations and composite materials.

Fatigue analysis - Our analysis enables visualisation of life and damage during cyclic loading and can help to predict where failure may occur.

Large deflection - Analysis of geometric nonlinearities caused by large deflections means that much more accuracy can be accounted for due to effects such a stress stiffening. Linear assumptions during structural analysis may lead to inaccuracies.

Explicit Dynamics Analysis

Whilst the results from manual or traditional engineering calculations are relatively easier to check, unfortunately, due to the complexity involved in the iterations of non-linear partial differential equations, checking CFD calculations can be tedious whereas conducting physical validations to determine the accuracy of CFD results may be impractical and/or economically prohibitive. Consequently, users may have to rely on CFD results per se to make informed decisions which may involve safety consequences or pecuniary value in the magnitude of several hundred millions of dollars. Obviously, having accurate CFD results will inspire confidence in the decision making process. The accuracy of CFD results depend on five governing factors, namely: 
- Boundary conditions (information to be provided by the client)
- Experience and track record of the firm in performing similar CFD projects
- Qualification and experience of the CFD specialist performing the simulation
- Quality control system
- Simulation software and hardware employed

One of the most important factors that determines the accuracy of any CFD result is the boundary conditions (BCs). Each of the mathematical equations requires meaningful values at the boundaries of the fluid domain for the calculations to generate reliable results. These numerical values are known as the boundary conditions and can be specified in several ways although in general the specification of multiphase phenomena or phenomena involving reactions is more complex than single phase phenomena. The use of wrong or inaccurate BCs will render the results inaccurate and must be prevented before modelling and simulation commence. We work closely with the clients and provide guidance to ensure that the BCs provided are meaningful, accurate and will lead to results that meet the objectives of the CFD studies. We have successfully delivered projects across many industries which exceeded client’s expectations both from the private and public sectors. The knowledge gained from an industry or project becomes part of the collective experience of the firm and is applied as when required to engineering problems emanating from other industries or projects. Thus, with a strong track record in delivering challenging engineering projects, we know exactly what to do, what directions to take and is strongly poised to provide the most appropriate recommendations to the clients.

Performing CFD simulations without proper knowledge may lead to misleading results. At Jimmy Lea & Chartered Engineers, only CFD consultants with a PhD qualification specialised and experienced in CFD are assigned to deliver CFD-related projects. We offer CFD consulting services substantiated by over 50 years of combined experience using ANSYS Fluent. Currently, our CFD specialists undertake complex projects related to aerodynamic, multiphase, multispecies, multiphysics, reaction chemistry, sliding mesh, combustion, energy and solidification-melting processes. With several PhDs specialised in CFD on-board, it is unsurprising that many clients consider us as a truly specialised engineering firm offering serious CFD consulting as one of its core services. To consistently deliver high quality reports, all projects are subjected to our stringent quality control system. Every stage is checked and reviewed to ensure the inputs or results are numerically accurate and make engineering-sense before being allowed to proceed to the next stage. This strategy prevents small errors emanating from each stage to snowball into a large error which ultimately affects the accuracy of the final results. Upon completion of all modelling and simulation iterations, the final results are independently reviewed by another PhD who has equivalent or more experienced in CFD-related projects. Eventually, all results and reports generated will be approved by our Engineering Director prior to submission to ensure a match between what the clients require and what is delivered.

Finally, we own ANSYS CFD perpetual licence with high performance computing (HPC) capability which enables parallel processing of the toughest, higher-fidelity models including more geometric details, larger systems and more complex physics. This provides a more accurate and detailed insight into the performance of a proposed design at a significantly shorter delivery time. In addition, by continually performing high fidelity simulations, we empower our clients to innovate new products or systems with a high degree of confidence that the accurate simulation results are predicting the actual performance of their products or systems under real-world conditions. ANSYS Fluent employs heavily validated models which provide assurance to stakeholders of high accuracy results. ANSYS fluid simulation solvers represent more than 1,000 person-years of R&D. This effort translates into the key benefits of fluid simulation software from ANSYS namely: experience, trust, depth and breadth. The CFD core solvers from ANSYS are trusted, used and relied upon by organisations worldwide.

Computational Fluid Dynamics (CFD)


The flow of fluids through pipe connections, over aerofoils, turbine blades and other structures can generate unsteady forces on the surrounding parts that cause them to move. This movement may be intentional and necessary or unintentional but unavoidable. Our simulation consultants which consist of FEA and CFD consultants are experience in coupling various modelling & simulation tools allow us to perform fluid structure interaction (FSI) analysis which can assist the clients to understand and solve product design challenges. Our FSI & simulation services include but not limited to:

Fluid Structure Coupling

- CFD based applications

- Mechanical based applications

Thermal Structural Coupling

- Engines, gas turbines, heat exchangers

- Cryogenic components and systems

Fluid Structural Interactions (FSI) Analysis