floating point error invalid number fluent Pandora Texas

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floating point error invalid number fluent Pandora, Texas

Viscosity Ratio超出了限定值 ()恕我直言,你的这个方法只是治标不治本,他这个问题多数是由于网格尺度太大引起的。也可能是边界条件上的湍流相关参数不合理导致的。[br][br][以下内容由 larky 在 2007年06月23日 00:00am 时添加] [br] 调大限制值可能导致发散 3 这是一个办法,能够解决一部分问题,有一些问题无论你怎么调整都没有用,如果出现这种情况可以通过调整初始流场,找到合适的初始值大部分能够解决,其实如果只是一开始初现这个问题,可以不作调整,除非影响到收敛性 4 在别的论坛上看到的: 为了尽快收敛对异值进行的限制,对最后收敛结果无影响 1)如果边界条件设置合理,一般来说会在收敛后自动消除。 2)为了加快收敛对异常的数值进行的限制(以引用2楼),是加快收敛的一种措施。 3)但是如果你的问题中流场变化很大,有可能在最后还会有。 4)如果网格不好会经常出现这种现象。 5)如果不想看见它总是报告而影响计算速度(写屏会降低计算速度),可以在下面把它关闭: solve->control->flow limit....具体记不住了,自己看看就知道了。 5 我也遇到这种情况,不过是在叠代求解的前一百多步,后面就没有了.因此我想是否是因为前面计算的误差大引起?而随着计算误差的减少,就消失了.如果是这样,就可以放心啦. 6 一般是边界上或是网格质量差的地方出现了奇点.由于是数值耗散,随着迭代次数越多,影响整个流场的范围越大,最终可能导致这个流场发散. 如果是网格质量差的地方出现,就只能重划网格了 如果是在边界上,一般是湍流相关参数设置不合理造成的,改成固定湍流比可能能解决 7 Why don't Otherwise, the appropriate infinity is returned. Raymond Toy Mon Jul 14 09:11:27 EDT 1997 X 鬲亘賱蹖睾丕鬲 賲丿蹖乇蹖鬲 夭賲丕賳 賵 賲賴賳丿爻蹖 賲讴丕賳蹖讴 氐賮丨賴 賳禺爻鬲 毓賳丕賵蹖賳 賲胤丕賱亘 賵亘賱丕诏 鬲賲丕爻 亘丕 毓賱蹖 乇丕丿 Okt. 2008 20:06 Unities abgeben: Nur für Think-Bommel Kannst du uns die Lösung schreiben ?Vielleicht hat ja bald nochmal jemand ein ähnliches Problem...------------------ http://osd.cad.de/Eine xe1.pde (1.1 k) Jay Bala (jay) New memberUsername: jayPost Number: 2Registered: 02-2008Posted on Monday, February 04, 2008 - 01:21 am: Thank you.

Maschinenbau Beitr鋑e: 89Registriert: 21.02.2004 erstellt am: 03. Are you sure you want to continue?CANCELOKWe've moved you to where you read on your other device.Get the full title to continueGet the full title to continue reading from where you Fragen und Anregungen: Kritik-Forum | Neues aus der Community: Community-Forum (c)2015 CAD.de Invalid Floating point error Log Out | Topics | Search Moderators | Register | Edit Profile FlexPDE User's Forum i have been working on this error for about 3 months but i could not (( July 29, 2014, 06:01 #12 HyperNova Senior Member B_Kia Join Date:

That's why you pay them. April 17, 2005, 20:49 Re: Floating point error-invalid number #3 Huong Guest Posts: n/a So where should have that problem, do you have any ideas that where it come GRID PROBLEMS -----?this error comes when I start scaling grid. If trapping is enabled, the divide-by-zero condition is signalled.

Okt. 2008 17:22 Unities abgeben: Hallo,vielen Dank erstmal fuer die schnellen Antworten..!!!Habe den Fehler gefunden..... !!!! I solve this problem by change (x or y direction) vector direction for mixture to Normal boundary in boundary condition menu for inlet and i use adaption to solve this problem. Or define your coordinates as Cartesian1. 2) Your equations have no spatial dependence. h.c.Bastler mit Diplom Beitr鋑e: 5895Registriert: 14.12.2004Gambit-2.4.6Fluent-6.3.26nur Testphase erstellt am: 02.

Otherwise, the rounded result is returned. :invalid This exception occurs when the result of an operation is ill-defined, such as (/ 0.0 0.0). Otherwise, a quiet NaN is returned. :divide-by-zero This exception occurs when a float is divided by zero. Here you get divide by zero type of floating point error. 2) Over or Underflow:- Another type is having data with either too large or too small magnitude called ';overflow'; or Okt. 2008 18:10 Unities abgeben: Nur für Think-Bommel hallo Think,Hast du in Gambit geometrische Input, Output und Control Plane definiert?Kannst du eine Skize uns zeigen oder ist geheim?Möglicherweise kann

The errors that are either because of invalid numeric computation initiated by user or limitation of machine that is used are floating point errors. 1)Invalid Operations:- Simplest example is if one April 14, 2005, 04:40 Re: Floating point error-invalid number #2 Alexander Starostin Guest Posts: n/a In particular if there is 1/x and x=0. In my experience, I set 1/3 Under-Relaxiation-Factors as default.? -----?also lower the values of under relaxation factor and use the coupled implicit solver? -----?Try to change under-relaxation factors and if it and the floating point error occur? -----?check the turbulence parameter you set.

When trapping is enabled for an exception, a error is signalled whenever that exception occurs. In order to get the time max of a variable, you also need to use the GLOBALMAX() or VAL(). The time now is 17:33. Add Thread to del.icio.us Bookmark in Technorati Tweet this thread BrowseBrowseInterestsBiography & MemoirBusiness & LeadershipFiction & LiteraturePolitics & EconomyHealth & WellnessSociety & CultureHappiness & Self-HelpMystery, Thriller & CrimeHistoryYoung AdultBrowse byBooksAudiobooksComicsSheet MusicBrowse

So you cannot take the TIME_MAX of a variable directly. e.g. If trapping is enabled, the floating-point-underflow condition is signalled. please help me I need it quick , my email : [email protected] July 30, 2014, 07:42 #13 HyperNova Senior Member B_Kia Join Date: May 2014 Location: Ir

your problem solve by selection a low mesh.? -----?Your mesh is so heavy that your computers resources are not enough. [Sponsors] Home News Index Post News Subscribe/Unsubscribe Forums Main CFD Forum System Analysis Structural Mechanics Electromagnetics CFD Freelancers Hardware Forum Lounge Software User Forums ANSYS CFX FLUENT Meshing & Geometry Autodesk Exceptions can be ignored, in which case some default action is taken, such as returning a special value. Board index The team • Delete all board cookies • All times are UTC Powered by phpBB Forum Software © phpBB Group 小木虫 --- 500万硕博科研人员喜爱的学术科研平台 登录 注册 客户端下载 小木虫 木虫搜索 首页

lmohammad gh 卮賳亘賴 17 丕爻賮賳丿鈥屬呚з 爻丕賱 1392 , 爻丕毓鬲 : 00:47 爻賱丕賲 禺爻鬲賴 賳亘丕卮蹖丿.丕賯丕蹖 乇丕丿 .賲賳 丕賱丕賳 禺丿賲鬲賲 賵 賲蹖禺賵丕賲 賵丕爻賴 丕乇卮丿 亘禺賵賳賲 .賲蹖禺賵丕爻鬲賲 丕夭鬲賵賳 賲卮丕賵乇賴 亘诏蹖乇賲 趩胤賵乇 亘禺賵賳賲 讴賴 乇鬲亘賴 This should work.? -----?Another reason could be a to high courant number - that means, that the steps between two iterations are too large and the change in the results is Usually, the initial flow condition used for the RSM run is obtained from the RNG k-e model result); First step: Solve - Controls - Solution -Default => iteration 第1页下一页 Word文档免费下载:Floating point At present, there is no way to get the time at which this maximum was reached.

Thanks so much. General Resources Events Event Calendars Specific Organizations Vendor Events Lists Misc Pictures and Movies Fun Links to Links Suggest New Link About this Section Jobs Post Job Ad List All Jobs April 1, 2013, 16:40 Floating point error: invalid number #10 ertebatbama New Member Join Date: Feb 2013 Posts: 3 Rep Power: 5 hi all, I had same problem in You can modify your history plot : HISTORY (Xe) at (1/2,1/2) REPORT (TIME_MAX(GLOBALMAX(Xe))) This will printout the value at the bottom of the history.

Is there any body who can help me, or is there anyone who can give me the right contact info for fluent people. That was an oversight on our part and we intend to add it soon (the TIME_MAX function itself was added in v5.0.16). If it's yours, use a debugger to trap the error. Otherwise, the operation results in the appropriate infinity. :inexact This exception occurs when the result of a floating point operation is not exact, i.e.

Okt. 2008 22:13 Unities abgeben: Nur für Think-Bommel Zum "floating point error" hab ich hier was gefunden:www.cfd-online.com/Wiki/Fluent_FAQ------------------ CoCreate: Hilfeseite I FAQ I Hilfreiche LinksEine Antwort You will have to read it from the history plot. In 2D, you need to define some area as your region. Eine Antwort auf diesen Beitrag verfassen (mit Zitat/Zitat des Beitrags) IP

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For example setting an internal boundary as interior? -----?Once I had the problem, simulating a 2D chamber with a symmetry BC. These are the possible floating point exceptions: :underflow This exception occurs when the result of an operation is too small to be represented as a normalized float in its format. Thank you for the help. Where can I find it? #6 Huong Guest Posts: n/a Hi Steve, YOu talking about debugger, where about in Fluent?

reduce the turbulence intensity to less that one for first, say 50 iterations. i.e. Specifically, if it's your code and it's written in Fortran, check that all your functions/subroutines have IMPLICIT NONE in them. Only registered users and moderators may post messages here.

try to use coarser mesh.? Viscosity Ratio 加多两个0,估计是一些单元的最大Turb. Here are some of the answers found in the Fluent Forum: From numerical computation view point , the basic operations performed by computer are represented inside computer in what is called April 18, 2005, 19:52 Re: Debugger ?

Again select the surface from which you want to compute the initial values & iterate. My email is [email protected] thanks HyperNova likes this.