Personal Simulation Workshop a Simulation Tool for aerodynamic Analysis and design …………… e
Personal Simulation Workshop A Simulation Tool for Aerodynamic Analysis and Design
Personal Simulation Workshop(PSW): OAK Digital Wing Tunnel(DWT) PSW is a streamline-body design and analysis package for the PC, comprising programs for surface definition, flow analysis, and data visualization Its three principal elements Loftsman geometric layout of external lines Cmarc flow analysis Postmark interpretation of results
Personal Simulation Workshop (PSW): Digital Wing Tunnel (DWT) • PSW is a streamline-body design and analysis package for the PC, comprising programs for surface definition, flow analysis, and data visualization. • Its three principal elements : – Loftsman • geometric layout of external lines – Cmarc • flow analysis – Postmarc • interpretation of results
Introduction to cmarc An inviscid fluid flow analysis code of the type known as a low- order panel method It is an enhanced version of nasa's pmarc-12 With modern desktop computers, dense meshes of 5,000 or more panels for a half-model can be analyzed in minutes Although the basic analysis is inviscid, a subsequent boundary layer analysis may be performed along individual streamlines or over the entire surface Provided that flow is attached and that large areas of crossflow do not appear, the boundary layer analysis is quite accurate Only the frictional and lift-induced components of drag can be computed, however; an inviscid analysis is inherently unable to calculate pressure or "form"drag Written in ANSI C
Introduction to Cmarc • An inviscid fluid flow analysis code of the type known as a loworder panel method. – It is an enhanced version of NASA's Pmarc-12 • With modern desktop computers, dense meshes of 5,000 or more panels for a half-model can be analyzed in minutes. • Although the basic analysis is inviscid, a subsequent boundarylayer analysis may be performed along individual streamlines or over the entire surface. – Provided that flow is attached and that large areas of crossflow do not appear, the boundary layer analysis is quite accurate. • Only the frictional and lift-induced components of drag can be computed, however; an inviscid analysis is inherently unable to calculate pressure or "form" drag. • Written in ANSI C
Introduction to cmarc Interface ..Cmarc V5.0 File selection Interactive Analysis Converged in 8 iterations Distributing doublet Strengths on Wake Panels Output Root Name: C: PSW\duela Calculating Velocities, Cp and Mach Numbers Stepping the wake Run Options Override Time Steps Override- v No override Number of time steps: Start Analysis D Run geometry and initial wake Time step size Time Stepping■■■■■■■■■■ Run geometry and stepped wake F Run added mass calculation only Save both FMT and BIN plot files Lower Higher Continue despite failure to converge AOA and Yaw Override Echo input to ECO file for debugging r write Postmarc data in ASCl fermat Multiple Analyses 厂 Yaw override C \PSW\duela. in C: \PSw \duela 10 blank D blank 厂 Set iteration limit C \PSW\duela in C \PSw \duela 10 blank 0 blank C: \PSW\duela. in C: \PSw\duela 1 0 blank 0 blank Remo Precision厂 Run on disk or井 columns in RAM #t or Save」 厂 Double Save Initial Solution Load r Use Initial Solution C:\PSW\duela.sol Submit after 7: 14:09 PM 彐 117/2002
Introduction to Cmarc Interface
飞 Digital Find Tunnel-[Po夏ARC.I ed File Edit view Window Analysis Help x 口囝回叫当? POMARC WING BODY COMBINATION TEST CASE FROM LOFTSMAN &biNP2 LSTINP=2 LSTOUT=0, LSTFRQ=0. LENRUN=0, LPLTYP=0. &END &BINP3 LSTGEO=O, LSTNAB=0, LSTWAK-0, LSTCP=0 &END &BINPA MAXIT=200, SOLRES=0.0005 &END &BINP5 NTSTPS=3, DTSTEP=300 &END &BINP6 RSYM=0.0, RGPR=0.0, RFF=5.0, RCoRES=0.050, RCOREW=0. 050, &END &BINP7 VINF=1.0. VSOUND=13392.0 &BINP8 ALDEG=4.0, YAWDEG=0.0, PHidoT=0.0, THEdOT=0.0, PSidOT=0.0, &END &BINP8A PHIMAX=0. 0 THEMAX 0.0, PSIMAX 0.0 WRx=0.0,wRY=0.0,WRz=0.0 &END &BINP8B DXMAX=0. 0. DYMAX.0. DZMAX 0.0 Wx=0.0,WrY=0.0,WTz=0.000, &END B|NP9cBAR=61.25,SREF=14400.0, SSPAN=120.0, RMRX=200.00,RMPY=0.00.RMPz=0.00, &END &BINP10 NORSET=0. NBCHGE=O, NCZONE=0 NCZPCH=O CZDUB=0.0. VREF=0.0 &END &BINP11 NORPCH=0, NORF=0, NORL=0 NOCF=0, NOCL=0. VNORM=0.0 &END &BINP12 KPAN=0. KSIDE=0, NEWNAB=0. NEWSID=0 &END & BINP13 NBLIT =1 &END &ASEM1 ASEMX= 0.0000, ASEMY= 0.0000, ASEMZ= 0.0000 ASCAL= 1.0000, ATHET= 0.0, NODEA= 5 8cOMP1CMR×=0.0000, COMPY=0.0000. COMPZ=0.0000, CSCALE 1.0000, CTHET= 0.0 NODEC= 5 &END &PATCHI IREV=0, IDPAT=1. MAKE=0, KcoMP=1 KASS=1, IPATSYM=0. IPATCOP=0, &END wNG[ Patch1,10×218 &SECT1 STX=0.0, STY=0.0, STZ=0.0, SCALE=1.0 ALF=0. 0, THETA=0., INMODE=4 TNODS=0, TNPS=0, TINTS=0 &END 214.727316.58460.0000 213.850316.5982-0.0393 211.259816.6341-0.1770 For Help, press F1 〓讲稿-2 T a Microsoft PowerP Digital Wind Tun m|.个9:28
c Postmarc v 4.7.3(D: \CFD\CFD Software\AeroLogic\Postmarclexample\ling-bodylving-body bin File yiew Display Derived Data What's New Help 幽占R@、回@四-感=四② y 开始讲2 「 Postmark Postmarc v 4.7.3
Postmarc v 4. 7. 3(D: \CFD\CFD Software\AeroLogic\Postmarc\example\ ing-body\ving-body bin File view Display Derived Data What's New Help 出占R@(、回@凹枣叫国创 0.06 Coefficient of pressure time state =3 File: d:cfdicfd softwarelaerologiclpostmarclexamplewwing-bodywing-body bin 0.0182 -0.0964 -0.253 -0.331 -0.409 -0.487 -0.644 -0.8
The CMARC input file o General format The file uses a fortran namelist format in which variable names are joined to values by equals signs Each line begins with an ampersand(&)in the second column and ends with &END The first column is empty Line feeds are ignored, and an input line may extend over several physical lines a generic line might look like this &Data VaR1=2. VaR2=0. VaR3=0. &END The commas may be omitted
The CMARC input file General format • The file uses a Fortran NAMELIST format in which variable names are joined to values by equals signs. • Each line begins with an ampersand (&) in the second column and ends with &END. – The first column is empty. – Line feeds are ignored, and an input line may extend over several physical lines. – A generic line might look like this: &DATA VAR1=2, VAR2=0, VAR3=0, &END • The commas may be omitted
The CMARc input file Units Any units of measure may be used, but they must be consistent throughout For example, if the body geometry is defined in inches, all speeds should be in inches per second rather than feet per second or miles per hour
The CMARC input file Units • Any units of measure may be used, but they must be consistent throughout. • For example, if the body geometry is defined in inches, all speeds should be in inches per second rather than feet per second or miles per hour
The CMARc input file Axes and rotations A conventional coordinate system is used X representing the longitudinal axis and increasing aft Y the spanwise axis increasing to the starboard Z the vertical axis increasing upward All rotations are performed in accordance with the right hand rule
The CMARC input file Axes and rotations • A conventional coordinate system is used – X representing the longitudinal axis and increasing aft – Y the spanwise axis increasing to the starboard – Z the vertical axis increasing upward. • All rotations are performed in accordance with the right hand rule
