An Improved Ghost-cell Immersed Boundary Method for Compressible Inviscid Flow Simulations

الموضوعات

علوم بحتة وطبيعية

الملخص

This study presents an improved ghost-cell immersed boundary approach to represent a solid body in compressible flow simulations. In contrast to the commonly used approaches, in the present work ghost cells are mirrored through the boundary described using a level-set method to farther image points, incorporating a higher-order extra/interpolation scheme for the ghost cell values. In addition, a shock sensor is in- troduced to deal with image points near the discontinuities in the flow field. Adaptive mesh refinement (AMR) is used to improve the representation of the geometry efficiently. The improved ghost-cell method is validated against five test cases: (a) double Mach reflections on a ramp, (b) supersonic flows in a wind tunnel with a forward- facing step, (c) supersonic flows over a circular cylinder, (d) smooth Prandtl-Meyer expansion flows, and (e) steady shock-induced combustion over a wedge. It is demonstrated that the improved ghost-cell method can reach the accuracy of second order in L1 norm and higher than first order in L∞ norm. Direct comparisons against the cut-cell method demonstrate that the improved ghost-cell method is almost equally accurate with better efficiency for boundary representation in high-fidelity compressible flow simulations. Implementation of the improved ghost-cell method in reacting Euler flows further validates its general applicability for compressible flow simulations.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0aebec7d-75f1-410f-bcc9-1fb3d8ae82a5

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1700193_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Hong G. Im","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Cheng Chi","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

An Improved Ghost-cell Immersed Boundary Method for Compressible Inviscid Flow Simulations

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Adaptive Mesh Refinement , Cartesoam Grid , Compressible Flow Simulation , Ghost-cell Immersed

إشراف وإعداد

الإشراف

Hong G. Im

الإعداد

Cheng Chi

الاقتباسات الببليوغرافية