Suppress Chapter Number and Chapter Title Completely

Question

I am working on the layout of my PhD thesis. For designing purpose, I would like to suppress the chapter number and chapter title completely without disturbing section numbering (Figure below).

Well, I managed to remove the chapter title easily by \chapter{}. Although with \chapter*{} chapter number disappears, it affects the section numbers. Is there any way to achieve this without disturbing section numbering?

Please note that the Table of Content is not important.

Thank you in advance. :)

my (sample) working code is as below:

\documentclass[11pt,twoside,openright]{report}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{lipsum}
\usepackage{appendix}

\usepackage{titlesec}
\titleformat{\chapter}[display]   
{\centering\huge\bfseries}{\LARGE\centering\MakeUppercase\thechapter\thispagestyle{empty}}{1pc}{}
\titlespacing*{\chapter}{0pt}{0pt}{0pt}

\begin{document}

\tableofcontents
\pagenumbering{arabic} \setcounter{page}{1}

%\chapter{Ch one}
\chapter*{}
\vspace{1cm}
\begin{center}
    \textbf{{\Large Abstract}}
\end{center}
\lipsum[2-3]

\mbox{}
\vfill

\noindent This chapter is based on:\newline

\noindent Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text Text text text .

\hspace{0pt}
\pagebreak


\section{section 1}
\lipsum[2-5]

\section{section 2}
\lipsum[2-5]

\end{document}