** Lecture summary and references:** pdf
file (this file is also updated in the owncloud folder)

## Goal

This course introduces the mathematical theory for the partial differential
equations (PDE) modeling the inviscid and viscous incompressible fluids, namely,
the incompressible Euler equations and incompressible Navier-Stokes equations. A
graduate student in either engineering, mathematics, or physics can hope to
learn an important branch of the PDE theory motivated by fluid mechanics.

## Topics

Here is the
tentative outline. It can be adjusted according to audience background
and feedback.

- Mathematical background
- Lebesgue integral and L^p spaces
- weak derivative and Sobolev spaces
- weak convergence
- solutions for the heat equation in a domain, Galerkin and semigroup
methods

- An introduction to incompressible fluid flows
- derivation of the Euler and Navier-Stokes equations
- symmetry groups and conserved quantities; some exact
solutions
- Leray's formulation and Hodge/Helmholtz decomposition

- Incompressible Euler equations
- The vorticity-stream formulation
- solution by energy method
- The particle-trajectory method
- The search for singular solutions

- Incompressible Navier-Stokes equations
- weak solutions, existence
- strong solutions, uniqueness and regularity
- mild solutions
- inviscid limit and boundary layer

## References

We will mostly cover selected sections from the following.

- Vorticity and Incompressible Flow, by Majda and Bertozzi.
(Its Math
Review)
- Lectures on Navier-Stokes equations, by Tsai

Files of these books and other references will be available in a public
owncloud folder, whose link will be given.

## Prerequisites

The required mathematical background will be covered in the first part of the
course. Most of them are covered in MATH 516, which is encouraged. However we
will not assume MATH 516, in order to broaden the audience base.

## Evaluation

The evaluation is based on homework assignments and class participation.

## Instructor and lectures

**Instructor:**
Dr. Tai-Peng Tsai, Math building
room 109, phone 604-822-2591, ttsai at math.ubc.ca.

**Lectures:**
Since Monday January 15, we meet on
Mondays 10-10:50am, Fridays 10-11:50am,
at
Jack Bell Building for the School of Social Work, Room 324.

**
Office hours:**
Mon, Wed, Thu 2pm-2:50pm, and
by appointment
(Tsai's schedule).