COMSOL Simulation for Crude Oil Preheating

Task Title: Simulation of Crude Oil Preheating in a Shell-and-Tube Heat Exchanger Using COMSOL Multiphysics

Description:
I need to simulate the process of crude oil preheating in a shell-and-tube heat exchanger using COMSOL Multiphysics. The goal is to create a time-dependent model that generates:

A temperature vs. time plot, showing how the temperature changes and reaches a plateau over a specific period.
A response to a step signal input, illustrating a temperature jump over time when subjected to a step change.
I already have a few preliminary models and would like these to be improved and finalized.

Deliverables:

An updated and optimized COMSOL model with detailed documentation of changes made.
A graph showing the temperature plateau over time.
A graph illustrating the system's response to a step signal input.
Requirements:

Experience with COMSOL Multiphysics, particularly in heat transfer and fluid flow simulations.
Knowledge of shell-and-tube heat exchanger design and operation.
Ability to provide clear documentation and explanations of the results.
Please share examples of similar COMSOL projects you've worked on, along with an estimated timeline and cost for this task.