Transient Thermal Analysis

Transient thermal analysis is at the core of what we do at our Singapore office at BroadTech Engineering.

Featured Case Study

Air Cooling of the Manual Transmission Clutch (Conjugate Heat Transfer Case)

One of the recent CFD thermal analysis projects was to develop a Heat Transfer Model in a manual transmission clutch. As the clutch was being applied, the high energy was causing the temperature of the clutch to exceed the design limit and fail.

Thus a CFD model was developed with a rotating clutch and heat transfer to the surrounding air. The air physics is turbulent. The FEM thermal analysis model solves of conduction and convection of heat from the clutch. The thermal simulation is run using an implicit unsteady solver and to increase run times, a moving reference frame approach is used.

A shape design optimization tool called Optimate was used. This is used to set an objective function such as maximization of heat transfer area and flow rate. The best design is then achieved by varying the different geometric parameters.

The optimized designs only had a marginal improvement in performance. This is because the transmission’s case did not have enough openings to scavenge cold air into the domain. These new case designs are currently being evaluated.

The VOF simulation explained in the previous question is an example of multiphase CFD simulation, since I am trying to simulate the free surface of oil as it interacts with air.

CFD Thermal Analysis (Transient) of the Mixing of 2 Air Jets

Mixing simulation for two jets of air with different temperature values inside a U-shaped tube was done in ANSYS Fluent and in-house CFD software for the comparative study. The thermal analysis results obtained in Fluent were taken as a basis to improve in-house CFD software.

Heat Transfer Modeling of a Wobble Plate Engine

The client thermodynamics simulation requirement was to study the operational compliance for various flow rates in the water jacket with different jacket radii.

Wobble plate engine is a device used in defense applications. The transient thermal analysis project aimed to optimize the water coolant jacket to meet operational compliance. A three-dimensional model was used with periodic boundary condition (axisymmetric model). Standard k-epsilon with wall functions was used. Modeling was performed in Ansys CFX. The meshing was done using ICEMCFD. Unstructured tetrahedral elements were used to generate the mesh. The CAD model was readily available, and hence only geometry clean-up was required.

Conjugate Heat Transfer (CHT) Analysis of Dry Clutch

Simulation Objective: The objective is to find the heat dissipation inside the clutch casing and to recommend design modification.

The Transient Thermal analysis involved CHT analysis of dry clutch assembly. Meshing, Solving and Volumetric heat generation analysis was carried out inside ANSYS Fluent. Temperature distribution across cube due to the phenomenon is observed.

Outcome & Conclusion

Design enablers like diameter increase and thickness increase are analyzed, and design changes recommended accordingly.

Transient and Steady State Thermal Analysis of a Rectangular Concentric Annulus

Simulation Objective

Thermosolutal Convection in a Rectangular Concentric Annulus.

Transient Buoyancy – Opposed Double-Diffusive Convection of Micropolar Fluids in a Square Enclosure.

Exhaust Heat Recovery from Automobile Exhaust

Methodology/Approach used

Transient NS equations and other field equations are solved.

FFT is used to translate the time series data to frequency domain

Different time series analysis techniques are used to study the transient behavior like phase plane analysis etc.

Outcome & Conclusion

The mechanism of stability and instability was obtained

Overview

1. FEA Consulting

2. CFD Consulting

3. LS-DYNA Consulting

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Forced Convective Heat Transfer Studies from Unconfined isothermal & isoflux Rectangular Cylinders

Forced Convective Heat Transfer Studies from Unconfined isothermal & isoflux Rectangular Cylinders
The SUPG-based numerical investigation is performed to study the effects of Re, AR on the heat transfer characteristics of the rectangular cylinder. The in-house code is validated with the available literature data. Here, both iso-thermal and iso-flux boundary conditions are considered for the entire study.
A detailed steady-state thermal analysis study of flow and thermal fields revealed the vortex merging phenomena results in a wavering and stretching of instantaneous isotherms, which in turn increases the total heat transfer. The breakage neck of isotherm is also observed in this study. The higher heat transfer appears on the leading edge side comparing to other edges for both the boundary conditions. Further, the total entropy generation is also implemented.