EDA, Inc.


EDA, Inc. provides engineering services for a wide range of needs. Thermal-Hydraulic evaluation and analysis is a service that is very specialized and should be performed by experienced personnel. EDA, Inc. has the experience and knowledge to complete the most challenging Thermal-Hydraulic evaluations. 

EDA, Inc. has experience in the following areas:

  • Steady State flow simulation with heat transfer, e. g., feedwater and service water system balancing.
  • Multi-Component, two-phase flow simulation, e. g., a) steam flow into a nitrogen filed containment, b) forces caused by a pump start after air is drawn into the pipe line by condensing steam.
  • Transient two-phase simulation, e. g., a) simulating the behavior of a reactor power plant during a small break in the primary or secondary systems or during an anticipate transient without scram.
  • Loss-of-Coolant-Accident simulations. These events are primarily evaluated for nuclear power plants. All aspects of thermal hydraulic simulation are explored including reactor kinetics and decay heat.

These are just a few examples. To get more detailed experience for one of the EDA, Inc. principals, go to EDA Resumes.


A Thermal-Hydraulic evaluation consists generally of three parts.

  1. Review problem or objective and decide on what tools to use.  This, of course is the most crucial part of the evaluation process. The engineer should look at all aspects of the problem and/or mission to determine the proper tools and techniques one should use to achieve accurate results and minimize cost. It is really important that the proper/correct thermal-hydraulic computer programs are selected. For example, if the fluid in the system being evaluated is single phase at high pressure, the design computer program of choice may be a finite element computer program. Some of the methods and computer programs available for finite element analyses are provided on the Finite Element page. If the process being evaluated is, for example, a steam generator, the more appropriate choice may be a finite difference program, e. g., RELAP5. Some of the thermal hydraulic computer programs are presented on the thermal hydraulic computer program page. Many Thermal Hydraulic Computer Programs are available and it is imperative that the appropriate computer programs are use the first time. It is also important that these programs have the proper quality assurance performed. This includes the validation of the program to simulate the process and the validation of the user to be able to use the program to simulate the process. All these areas are important in the initial phases of the evaluation to ensure that cost is held to a minimum. In all cases, scope analyses should be completed to determine the initial estimates of analytical response and cost. In some cases these analyses reveal that a more detailed analysis is not required and the project cost may be reduced significantly. Many of these initial analyses can be performed using the calculators provided at this site.
  2. Once the calculations are finished, they must be reviewed for accuracy and for practicality. This review is usually accomplished by the QA reviewer following the procedures provided in the QA program. The quality of the practicality review is based on the experience level of the organization that has completed the calculation and on the experience level of the reviewing organization. Questions that should be answered even for large established companies. These questions are: a) Is there an adequate experience level of the performer and reviewer to provide a good safe and reliable product? and b) Were the evaluations performed according to necessary regulatory and company standards?
  3. The final product must be delivered in a form that is transferable, readable and defendable.  For any given project, EDA, Inc. ensures proper QA for the software and provides experienced individuals so the product can be presented successfully in front of law enforcement and/or regulatory bodies. Additionally, the final recommended solution must be practical enough to install. In most cases it will be necessary for the analyst to interface with the system and construction engineers so the final product can be installed successfully. EDA, Inc personnel have many years of experience in implementing analytical solutions into operating designs.

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Informative Links


T/H Central is a larger production of EDA, Inc. Thermal Hydraulics.  T/H Central is dedicated to providing the most up to date information in the area of thermal hydraulics and fluid dynamic engineering and analysis.  The site has extensive information on fluid dynamics and heat transfer, which are integral technical specialties of thermal hydraulics. T/H Central also provides information on many areas of fluid flow, material properties, numerical methods, research, computer software and other related topics.

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